Dozyite Mineral Data

Dozyite Mineral Data +

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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.

Synonym:

ICSD 77351

IMA1993-042

PDF 47-1866

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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 - DomaticH-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),

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

Physical Properties of Dozyite

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

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

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:

r_electron=2.66 gm/cc
note: r_Dozyite=2.64 gm/cc.

Fermion Index

Fermion Index = 0.02692
Boson Index = 0.97308

Photoelectric:

PE_Dozyite= 1.38 barns/electron
U=PE_Dozyite x r_electron= 3.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Dozyite is Not Radioactive

Dozyite Classification

Dana Class:

71.4.2.1 (71)Phyllosilicate Sheets of Six-Membered Rings

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

(71.4.2)Interstratified Chlorite-Smectite group

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

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

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

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

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

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

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

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

71.4.2.9 Glagolevite! NaMg6[Si3AlO10](OH,O)8·H2O C1 1

Strunz Class:

VIII/H.27-95 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.27 - Serpentine group

VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1

VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono

VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono

VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono

VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono

VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm 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 -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 :

Dozyite

(Mg7Al2)(Si4Al2)O15(OH)12
Dana No: 71.4.2.1 Strunz No: VIII/H.27-95
Locality:

Notes: