General Dozyite Information
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Chemical Formula: |
(Mg7Al2)(Si4Al2)O15(OH)12 |
Composition: |
Molecular Weight = 834.48 gm |
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Magnesium 20.39 % Mg 33.81 % MgO |
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Aluminum 12.93 % Al 24.44 % Al2O3 |
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Silicon 13.46 % Si 28.80 % SiO2 |
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Hydrogen 1.45 % H 12.95 % H2O |
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Oxygen 51.77 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Mg7Al4Si4O15(OH)12 |
Environment: |
Altered skarn near a copper-gold-silver ore zone. Cr-rich serpentinite. |
IMA Status: |
Approved IMA 1995 |
Locality: |
Ertsberg East complex, Carstensz Mountains, central Irian Jaya, Indonesia. Wood Chrome mine, Lancaster Co., Pennsylvania, USA. Link to MinDat.org Location Data. |
Name Origin: |
Named for the Dutch geologist Jean-Jacques Dozy (1908 - 2004), who discovered the Ertzberg mineral deposits. |
Synonym: |
ICSD 77351 |
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IMA1993-042 |
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PDF 47-1866 |
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Images:
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Dozyite Crystallography
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Axial Ratios: |
a:b:c =0.5777:1:2.3279 |
Cell Dimensions: |
a = 5.323, b = 9.214, c = 21.45, Z = 2; beta = 94.717° V = 1,048.48 Den(Calc)= 2.64 |
Crystal System: |
Monoclinic - DomaticH-M Symbol (m) Space Group: Cm |
X Ray Diffraction: |
By Intensity(I/Io): 7.129(1), 3.56(0.8), 2.427(0.6), |
Crystal Structure:
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Banfield J F , Bailey S W , American Mineralogist , 81 (1996) p.79-91, Formation of regularly interstatified serpentine-chlorite minerals by, tetrahedral inversion in long-period serpentine polytypes
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Physical Properties of Dozyite
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Cleavage: |
[001] Perfect |
Color: |
Colorless, Light violet, Light green. |
Density: |
2.66 |
Diaphaniety: |
Translucent |
Habit: |
Euhedral Crystals - Occurs as well-formed crystals showing good external form. |
Habit: |
Platy - Sheet forms (e.g. micas). |
Hardness: |
2.5 - Finger Nail |
Luminescence: |
Non-fluorescent. |
Luster: |
Pearly |
Streak: |
white |
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Optical Properties of Dozyite
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Gladstone-Dale: |
CI meas= 0.024 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2186,KPDmeas= 0.2169,KC= 0.2221 |
Optical Data: |
Biaxial (+), a=1.575, b=1.575, g=1.581, bire=0.0060, 2V(Calc)=0, 2V(Meas)=0-5. Dispersion very weak. |
Pleochroism (x): |
colorless. |
Pleochroism (y): |
colorless. |
Pleochroism (z): |
very pale tan. |
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Calculated Properties of Dozyite
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Electron Density: |
relectron=2.66 gm/cc note: rDozyite =2.64 gm/cc. |
Fermion Index |
Fermion Index = 0.02692 Boson Index = 0.97308 |
Photoelectric: |
PEDozyite = 1.38 barns/electron U=PEDozyite x relectron= 3.66 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Dozyite is Not Radioactive |
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Dozyite Classification
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Dana Class: |
71.4.2.1 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.4)interlayered 1:1, 2:1, and octahedra |
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(71.4.2)Interstratified Chlorite-Smectite group |
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71.4.2.1 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m |
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71.4.2.2 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono |
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71.4.2.3 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m |
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71.4.2.4 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12·5(H2O) Unk Ortho |
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71.4.2.5 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10·n(H2O) Unk Ortho |
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71.4.2.6 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono |
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71.4.2.7 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4·2(H2O) Unk Mono |
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71.4.2.8 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2·n(H2O) Unk Mono |
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71.4.2.9 Glagolevite! NaMg6[Si3AlO10](OH,O)8·H2O C1 1 |
Strunz Class: |
VIII/H.27-95 VIII - Silicates |
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VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups |
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VIII/H.27 - Serpentine group |
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VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m |
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VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1 |
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VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono |
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VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho |
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VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho |
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VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono |
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VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono |
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VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m |
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VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m |
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VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono |
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VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m |
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VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1 |
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VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6 |
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VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m |
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VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono |
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VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2 |
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VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m |
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VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2 |
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VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono |
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VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m |
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Other Dozyite Information
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References: |
NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.80,p65-67,1995) OPTIC PROP.(MinRec) |
See Also: |
Links to other databases for Dozyite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -MinDAT
7 -MinMax(Deutsch)
8 -MinMax(English)
9 -Mineralienatlas (Deutsch)
10 -QUT Mineral Atlas
11 - WWW-MINCRYST
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Print or Cut-and-Paste your Dozyite Specimen Label here :
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Dozyite
(Mg7Al2)(Si4Al2)O15(OH)12
Dana No: 71.4.2.1 Strunz No: VIII/H.27-95
Locality:
Notes:
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