Dozyite Mineral Data

General Dozyite Information

Chemical Formula:

(Mg7Al2)(Si4Al2)O15(OH)12

Composition:

Molecular Weight = 834.48 gm

Magnesium 20.39 % Mg 33.81 % MgO

Aluminum 12.93 % Al 24.44 % Al₂O₃

Silicon 13.46 % Si 28.80 % SiO₂

Hydrogen 1.45 % H 12.95 % H₂O

Oxygen 51.77 % O

______ ______

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.

Name Pronunciation:

Dozyite

Synonym:

ICSD 77351

IMA1993-042

PDF 47-1866

Dozyite Crystallography

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 - Domatic H-M Symbol (m) Space Group: Cm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.129(1), 3.56(0.8), 2.427(0.6),

Physical Properties of Dozyite

Cleavage:

{001} Perfect

Color:

Colorless, Light violet, Light green.

Density:

2.66

Diaphaneity:

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

Optical Properties of Dozyite

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
Ncalc = 1.59

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.

Calculated Properties of Dozyite

Electron Density:

Bulk Density (Electron Density)=2.66 gm/cc
note: Specific Gravity of Dozyite =2.64 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Dozyite= 1.38 barns/electron
U=PE_Dozyite x rElectron Density= 3.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dozyite is Not Radioactive

Dozyite Classification

Dana Class:

71.04.02.01 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.04)interlayered 1:1, 2:1, and octahedra

(71.04.02)Interstratified Chlorite-Smectite group

71.04.02.01 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

71.04.02.02 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono

71.04.02.03 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m

71.04.02.04 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12•5(H2O) Unk Ortho

71.04.02.05 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10•n(H2O) Unk Ortho

71.04.02.06 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono

71.04.02.07 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4•2(H2O) Unk Mono

71.04.02.08 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2•n(H2O) Unk Mono

71.04.02.09 Glagolevite! NaMg6[Si3AlO10](OH,O)8•H2O C1 1

Strunz Class:

09.EC.60 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.60 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2•n(H2O) Unk Mono

09.EC.60 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

09.EC.60 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10•n(H2O) Unk Ortho

09.EC.60 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono

09.EC.60 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono

09.EC.60 Illite* (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] C 2/m 2/m

09.EC.60 Hydrobiotite [K(Mg,Fe)3(Al,Fe)Si3O10(OH,F)2]•[(Mg,Fe,Al)3(Si,Al)4O10(OH)2•4(H2O)] C 2/m 2/m

09.EC.60 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono

09.EC.60 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4•2(H2O) Unk Mono

09.EC.60 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m

09.EC.60 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12•5(H2O) Unk Ortho

09.EC.60 Brinrobertsite! (Na,K,Ca)x(Al,Fe,Mg)4(Si,Al)8O20(OH)4•3.54(H2O)[x=0.35,n=3.54] pseudo 2/m 2/m

Other Dozyite Information

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 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info
12 - WWW-MINCRYST

Search for Dozyite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Dozyite :

Ask about Dozyite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Dozyite Specimen Label here :

Dozyite

(Mg7Al2)(Si4Al2)O15(OH)12
Dana No: 71.04.02.01 Strunz No: 09.EC.60
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.