Datolite Mineral Data + 
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- 54.2.1a.1 Datolite CaBSiO4(OH) P 21/c 2/m
- 54.2.1a.2 Hingganite-(Ce) Ce2Be2(SiO4)2(OH)2 P 21/a 2/m
- 54.2.1a.3 Hingganite-(Y) Y2([])Be2Si2O8(OH)2 P 21/a 2/m
- 54.2.1a.4 Hingganite-(Yb) (Yb,Y)2([])Be2Si2O8(OH)2 P 21/a 2/m
- 54.2.1a.5 Calcybeborosilite-(Y)! (REE,Ca)2[](B,Be)2(SiO4)2(OH,O)2 P 21/a 2/m
- VIII/B.29-10 Datolite CaBSiO4(OH) P 21/c 2/m
- VIII/B.29-20 Bakerite Ca4B4(BO4)(SiO4)3(OH)3·(H2O) P 21/c 2/m
- VIII/B.29-30 Homilite Ca2(Fe,Mg)B2Si2O10 P 21/a 2/m
- VIII/B.29-35 Vistepite Mn4SnB2(SiO4)4(OH)2 P1 1
- VIII/B.29-40 Minasgeraisite-(Y) CaY2Be2Si2O10 P 21/a 2/m
- VIII/B.29-50 Gadolinite-(Y) Y2FeBe2Si2O10 P 21/a 2/m
- VIII/B.29-60 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 21/c 2/m
- VIII/B.29-70 Hingganite-(Y) Y2([])Be2Si2O8(OH)2 P 21/a 2/m
- VIII/B.29-80 Hingganite-(Ce) Ce2Be2(SiO4)2(OH)2 P 21/a 2/m
- VIII/B.29-90 Hingganite-(Yb) (Yb,Y)2([])Be2Si2O8(OH)2 P 21/a 2/m
- VIII/B.29-100 Calcybeborosilite-(Y)! (REE,Ca)2[](B,Be)2(SiO4)2(OH,O)2 P 21/a 2/m
General Datolite Information |
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 Chemical Formula: |
CaBSiO4(OH) | ||
| Composition: |
Molecular Weight = 159.98 gm | ||
| Calcium 25.05 % Ca 35.05 % CaO | |||
| Silicon 17.56 % Si 37.56 % SiO2 | |||
| Boron 6.76 % B 21.76 % B2O3 | |||
| Hydrogen 0.63 % H 5.63 % H2O | |||
| Oxygen 50.00 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
CaB(SiO4)(OH) | ||
| Environment: |
Secondary mineral in basic igneous rocks. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1806 | ||
| Locality: |
Diabases of the Connecticut River valley, USA. Link to MinDat.org Location Data. | ||
| Name Origin: |
From the Greek, dateisthai, meaning "to divide," because granular aggregates crumble readily. | ||
| Synonym: |
ICSD 22026 | ||
| PDF 36-429 | |||
Datolite Image | |||
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Images:
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Datolite Crystallography |
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| Axial Ratios: |
a:b:c =1.2643:1:0.6321 | ||
| Cell Dimensions: |
a = 9.66, b = 7.64, c = 4.83, Z = 4; beta = 90.15° V = 356.46 Den(Calc)= 2.98 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.114(1), 2.855(0.65), 2.189(0.6), | ||
| Forms:
Mouse |
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Crystal Structure:
Mouse |
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Physical Properties of Datolite |
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| Cleavage: |
None | ||
| Color: |
Brown, Colorless, Yellow, White, Light green. | ||
| Density: |
2.8 - 3, Average = 2.9 | ||
| Diaphaniety: |
Transparent to translucent | ||
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
| Habit: |
Porcelainous - Fine-grained, translucent massive material like broken china | ||
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
| Hardness: |
5.5 - Knife Blade | ||
| Luminescence: |
None. | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Datolite |
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| Gladstone-Dale: |
CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2181,KPDmeas= 0.2241,KC= 0.2177 |
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| Optical Data: |
Biaxial (-), a=1.626, b=1.653-1.654, g=1.67, bire=0.0440, 2V(Calc)=72-74, 2V(Meas)=74. Dispersion none. | ||
| Pleochroism (x): |
colorless. | ||
| Pleochroism (y): |
colorless. | ||
| Pleochroism (z): |
colorless. | ||
Calculated Properties of Datolite |
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| Electron Density: |
relectron=2.98 gm/cc |
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| Fermion Index |
Fermion Index = 0.02222 Boson Index = 0.97778 |
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| Photoelectric: |
PEDatolite = 3.83 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Datolite is Not Radioactive |
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Datolite Classification |
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| Dana Class: |
54.2.1a.1 (54)Nesosilicate Borosilicates and Some Beryllosilicates | ||
| (54.2)with B in [4] coordination | |||
| (54.2.1a)Datolite group (Datolite series) | |||
| Strunz Class: |
VIII/B.29-10 VIII - Silicates | ||
| VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron | |||
| VIII/B.29 - Datolite/Gadolinite group | |||
Other Datolite Information |
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| References: |
NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68) | ||
| See Also: |
Links to other databases for Datolite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Amethyst Galleries' Mineral Gallery 6 - Athena 7 - EUROmin Project 8 - Ecole des Mines de Paris 9 - Franklin Minerals(Dunn) 10 - Franklin Minerals(Palache) 11 - Glendale Community College 12 - Google Images 13 - Google Scholar 14 - Handbook of Mineralogy (MinSocAm) 15 - Handbook of Mineralogy (UofA) 16 - MinDAT 17 - MinMax(Deutsch) 18 - MinMax(English) 19 - Mineralienatlas (Deutsch) 20 - QUT Mineral Atlas 21 - Ruff.Info 22 - WWW-MINCRYST 23 - YupRocks 24 - theimage Search for Datolite using: Visit our Advertisers for Datolite : AA Mineral SpecimensB & L Fine Minerals Dan Weinrich Fine Minerals Dan Weinrich Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals The GeoZone Wrights Rock Shop Translate Datolite Mineral Data : Ask about Datolite here : Print or Cut-and-Paste your Datolite Specimen Label here :
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