General Tremolite Information
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Chemical Formula: |
[ ]Ca2Mg5Si8O22(OH)2 |
Composition: |
Molecular Weight = 812.37 gm |
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Calcium 9.87 % Ca 13.81 % CaO |
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Magnesium 14.96 % Mg 24.81 % MgO |
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Silicon 27.66 % Si 59.17 % SiO2 |
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Hydrogen 0.25 % H 2.22 % H2O |
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Oxygen 47.27 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Ca2Mg5(Si8O22)(OH)2 |
Environment: |
Contact metamorphism of Ca rich rocks. |
IMA Status: |
Valid Species (Pre-IMA) 1790 |
Locality: |
Tremola Valley, Alps. Link to MinDat.org Location Data. |
Name Origin: |
Named after its locality. |
Synonym: |
ICSD 30126 |
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PDF 44-1402 |
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Tremolite Image |
Images:
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Tremolite
Comments: Dark green tremolite crystal cluster.
Location: Selleck Road Locality, West Pierrepont, St Lawrence Co., New York, USA.
Scale: 4.5x2x1.5 cm.
© John Betts - Fine Minerals |
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Tremolite Crystallography
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Axial Ratios: |
a:b:c =0.5449:1:0.2923 |
Cell Dimensions: |
a = 9.8385, b = 18.0554, c = 5.2778, Z = 2; beta = 104.751° V = 906.64 Den(Calc)= 2.98 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m |
X Ray Diffraction: |
By Intensity(I/Io): 3.12(1), 8.38(1), 2.71(0.9), |
Crystal Structure:
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Sueno S , Cameron M , Papike J J , Prewitt C T , American Mineralogist , 58 (1973) p.649-664, The high temperature crystal chemistry of tremolite, T = 400 C
View Additional jPOWD Structure files for Tremolite
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Physical Properties of Tremolite
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Cleavage: |
[110] Perfect, [010] Distinct |
Color: |
Brown, Colorless, Gray, White, Light green. |
Density: |
2.9 - 3.2, Average = 3.05 |
Diaphaniety: |
Transparent to translucent |
Fracture: |
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. |
Habit: |
Columnar - Forms columns |
Habit: |
Massive - Fibrous - Distinctly fibrous fine-grained forms. |
Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
Hardness: |
5-6 - Between Apatite and Orthoclase |
Luminescence: |
Fluorescent, Short UV=yellow, Long UV=pink. |
Luster: |
Vitreous - Pearly |
Streak: |
white |
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Optical Properties of Tremolite
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Gladstone-Dale: |
CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2076,KPDmeas= 0.2028,KC= 0.2092 |
Optical Data: |
Biaxial (-), a=1.599-1.612, b=1.613-1.626, g=1.625-1.637, bire=0.0250-0.0260, 2V(Calc)=82-84, 2V(Meas)=88-80. Dispersion r < v. |
Pleochroism (x): |
colorless. |
Pleochroism (y): |
colorless. |
Pleochroism (z): |
colorless. |
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Calculated Properties of Tremolite
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Electron Density: |
relectron=2.98 gm/cc note: rTremolite =2.98 gm/cc. |
Fermion Index |
Fermion Index = 0.02823 Boson Index = 0.97177 |
Photoelectric: |
PETremolite = 2.61 barns/electron U=PETremolite x relectron= 7.76 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tremolite is Not Radioactive |
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Tremolite Classification
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Dana Class: |
66.1.3a.1 (66)Inosilicate Double-Width Unbranched Chains, W=2 |
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(66.1)Dana Type |
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(66.1.3a)Group 2, the calcic amphiboles |
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66.1.3a.1 Tremolite []Ca2Mg5Si8O22(OH)2 C 2/m 2/m |
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66.1.3a.2 Actinolite Ca2(Mg,Fe)5Si8O22(OH)2 C 2/m 2/m |
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66.1.3a.3 Ferro-actinolite []Ca2Fe5Si8O22(OH)2 C 2/m 2/m |
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66.1.3a.4 Magnesiohornblende Ca2[Mg4(Al,Fe)]Si7AlO22(OH)2 C 2/m 2/m |
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66.1.3a.5 Ferrohornblende []Ca2[Fe4(Al,Fe)]Si7AlO22(OH)2 C 2/m 2/m |
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66.1.3a.6 Tschermakite []Ca2(Mg3AlFe)Si6Al2O22(OH)2 C 2/m 2/m |
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66.1.3a.6a Aluminoferrotschermakite! []Ca2(Fe2)3Al2(Si6Al2)O22(OH)2 C 2/m 2/m |
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66.1.3a.6b Ferri-ferrotschermakite! []Ca2(Fe2)3(Fe3)2(Si6Al2)O22(OH)2 C 2/m 2/m |
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66.1.3a.6c Ferrotschermakite! []Ca2(Fe3AlFe)Si6Al2O22(OH) C 2/m 2/m |
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66.1.3a.7 Ferro-aluminotschermakite* Ca2Fe3Al2(Si7Al)O22(OH)2 C 2/m 2/m |
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66.1.3a.8 Ferritschermakite Ca2(Fe,Mg)3Al2(Si7Al)O22(OH)2 C 2/m 2/m |
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66.1.3a.9 Ferroferritschermakite* Ca2(Fe,Mg)3Fe2(Si7Al)O22(OH)2 C 2/m 2/m |
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66.1.3a.10 Edenite NaCa2Mg5Si7AlO22(OH)2 C 2/m 2/m |
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66.1.3a.10a Fluoro-edenite! NaCa2Mg5Si7AlO22(F,OH)2 C 2/m 2/m |
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66.1.3a.11 Ferro-edenite NaCa2Fe5Si7AlO22(OH)2 C 2/m 2/m |
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66.1.3a.12 Pargasite NaCa2(Mg,Fe)4Al(Si6Al2)O22(OH)2 C 2/m 2/m |
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66.1.3a.12a Potassicpargasite! (K,Na)Ca2(Mg,Fe)5Si8O22(OH,F)2 C 2/m 2/m |
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66.1.3a.13 Ferropargasite NaCa2(Fe4Al)Si6Al2O22(OH)2 C 2/m 2/m |
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66.1.3a.13a Ferrochloropargasite! NaCa2(Fe4Al)Si6Al2O22Cl2 C 2/m 2/m |
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66.1.3a.13b Potassic-chloropargasite! (K,Na)Ca2(Mg,Fe2)4Al(Si6Al2O22)(Cl,OH)2 C 2/m 2/m |
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66.1.3a.14 Magnesiohastingsite NaCa2(Mg4Fe)Si6Al2O22(OH)2 C 2/m 2/m |
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66.1.3a.15 Hastingsite NaCa2(Fe4Fe)Si6Al2O22(OH)2 C 2/m 2/m |
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66.1.3a.15a Potassic-chlorohastingsite! (K,Na)Ca2(Fe,Mg)4Fe[Si6Al2O22](Cl,OH)2 C 2/m 2/m |
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66.1.3a.16 Potassic-magnesiosadanagaite (K,Na)Ca2(Mg,Fe,Al,Ti)5[(Si,Al)8O22](OH)2 C 2,Cm,C 2/m Mono |
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66.1.3a.17 Sadanagaite (K,Na)Ca2(Fe,Mg,Al,Ti)5[(Si,Al)8O22](OH)2 C 2,Cm,C 2/m Mono |
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66.1.3a.17a Potassicsadanagaite! (K,Na)Ca2[Fe3(Al,Fe)2][Si5Al3O22](OH)2 C 2,Cm,C 2/m Mono |
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66.1.3a.17b Potassicferrisadanagaite! (K,Na)Ca2(Fe,Mg)2(Fe,Al)2[Si5Al3O22](OH,F,O)2 C 2/m 2/m |
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66.1.3a.17c Magnesiosadanagaite! NaCa2[Mg3(Al,Fe)2]Si5AlO22(OH)2 C 2/m 2/m |
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66.1.3a.18 Kaersutite NaCa2(Mg4Ti)Si6Al2O23(OH)2 C 2/m 2/m |
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66.1.3a.19 Ferrokaersutite NaCa2(Fe4Ti)Si6Al2O22(OH)2 C 2/m 2/m |
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66.1.3a.20 Fluorocannilloite! CaCa2(Mg4Al)Si5Al3O22F2 C 2/m 2/m |
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66.1.3a.20a Cannilloite! CaCa2Mg4Al(Si5Al3)O22(OH)2 C 2/m 2/m |
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66.1.3a.21 IMA2004-034! ([],Na)(Na,Ca)2(Mg,Fe)4Fe[Si8O22](OH)2 C 2/m 2/m |
Strunz Class: |
VIII/F.10-10 VIII - Silicates |
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VIII/F - Inosilicates (chain and band) double chains [Si4O11]6- , Ca2-Amphiboles |
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VIII/F.10 - Amphibole group, Tremolite - Sadanagaite series |
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VIII/F.10-10 Tremolite []Ca2Mg5Si8O22(OH)2 C 2/m 2/m |
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VIII/F.10-20 Actinolite Ca2(Mg,Fe)5Si8O22(OH)2 C 2/m 2/m |
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VIII/F.10-30 Ferro-actinolite []Ca2Fe5Si8O22(OH)2 C 2/m 2/m |
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VIII/F.10-40 Magnesiohornblende Ca2[Mg4(Al,Fe)]Si7AlO22(OH)2 C 2/m 2/m |
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VIII/F.10-50 Ferrohornblende []Ca2[Fe4(Al,Fe)]Si7AlO22(OH)2 C 2/m 2/m |
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VIII/F.10-60 Tschermakite []Ca2(Mg3AlFe)Si6Al2O22(OH)2 C 2/m 2/m |
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VIII/F.10-65 Aluminoferrotschermakite! []Ca2(Fe2)3Al2(Si6Al2)O22(OH)2 C 2/m 2/m |
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VIII/F.10-70 Ferrotschermakite! []Ca2(Fe3AlFe)Si6Al2O22(OH) C 2/m 2/m |
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VIII/F.10-75 Ferro-aluminotschermakite* Ca2Fe3Al2(Si7Al)O22(OH)2 C 2/m 2/m |
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VIII/F.10-77 Ferritschermakite Ca2(Fe,Mg)3Al2(Si7Al)O22(OH)2 C 2/m 2/m |
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VIII/F.10-80* Ferri-ferrotschermakite! []Ca2(Fe2)3(Fe3)2(Si6Al2)O22(OH)2 C 2/m 2/m |
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VIII/F.10-80 Ferroferritschermakite* Ca2(Fe,Mg)3Fe2(Si7Al)O22(OH)2 C 2/m 2/m |
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VIII/F.10-90 Edenite NaCa2Mg5Si7AlO22(OH)2 C 2/m 2/m |
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VIII/F.10-92 Fluoro-edenite! NaCa2Mg5Si7AlO22(F,OH)2 C 2/m 2/m |
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VIII/F.10-100 Ferro-edenite NaCa2Fe5Si7AlO22(OH)2 C 2/m 2/m |
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VIII/F.10-104 Cannilloite! CaCa2Mg4Al(Si5Al3)O22(OH)2 C 2/m 2/m |
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VIII/F.10-105 Fluorocannilloite! CaCa2(Mg4Al)Si5Al3O22F2 C 2/m 2/m |
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VIII/F.10-110 Pargasite NaCa2(Mg,Fe)4Al(Si6Al2)O22(OH)2 C 2/m 2/m |
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VIII/F.10-120 Ferropargasite NaCa2(Fe4Al)Si6Al2O22(OH)2 C 2/m 2/m |
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VIII/F.10-125 Potassicpargasite! (K,Na)Ca2(Mg,Fe)5Si8O22(OH,F)2 C 2/m 2/m |
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VIII/F.10-130 Magnesiohastingsite NaCa2(Mg4Fe)Si6Al2O22(OH)2 C 2/m 2/m |
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VIII/F.10-140 Hastingsite NaCa2(Fe4Fe)Si6Al2O22(OH)2 C 2/m 2/m |
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VIII/F.10-150 Kaersutite NaCa2(Mg4Ti)Si6Al2O23(OH)2 C 2/m 2/m |
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VIII/F.10-160 Ferrokaersutite NaCa2(Fe4Ti)Si6Al2O22(OH)2 C 2/m 2/m |
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VIII/F.10-163 Potassicsadanagaite! (K,Na)Ca2[Fe3(Al,Fe)2][Si5Al3O22](OH)2 C 2,Cm,C 2/m Mono |
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VIII/F.10-165 Potassic-magnesiosadanagaite (K,Na)Ca2(Mg,Fe,Al,Ti)5[(Si,Al)8O22](OH)2 C 2,Cm,C 2/m Mono |
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VIII/F.10-170 Magnesiosadanagaite! NaCa2[Mg3(Al,Fe)2]Si5AlO22(OH)2 C 2/m 2/m |
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VIII/F.10-180 Sadanagaite (K,Na)Ca2(Fe,Mg,Al,Ti)5[(Si,Al)8O22](OH)2 C 2,Cm,C 2/m Mono |
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VIII/F.10-220 Potassicferrisadanagaite! (K,Na)Ca2(Fe,Mg)2(Fe,Al)2[Si5Al3O22](OH,F,O)2 C 2/m 2/m |
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Other Tremolite Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) |
See Also: |
Links to other databases for Tremolite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 -Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Applied Mineralogy
6 -Athena
7 - CalTech Mineral Spectroscopy
8 - Crocoite.com Mineral Locations
9 - EUROmin Project
10 - Franklin Minerals(Dunn)
11 -Google Images
12 -Google Scholar
13 -Handbook of Mineralogy (MinSocAm)
14 -Handbook of Mineralogy (UofA)
15 - HyperPhysics
16 -MinDAT
17 -MinMax(Deutsch)
18 -MinMax(English)
19 - Mineral and Gemstone Kingdom
20 -Mineralienatlas (Deutsch)
21 - Minerals in Thin Section-University of North Carolina
22 -Minerals in Thin Sections-Humboldt State
23 - Minerals of Wisconsin
24 -QUT Mineral Atlas
25 - Scandinavian mineral gallery
26 - University of Manchester - Mineral Structure
27 -University of Minnesota
28 - WWW-MINCRYST
29 - YupRocks
30 -École des Mines de Paris
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Tremolite
[ ]Ca2Mg5Si8O22(OH)2
Dana No: 66.1.3a.1 Strunz No: VIII/F.10-10
Locality:
Notes:
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