Donbassite Mineral Data

Donbassite Mineral Data +

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General Donbassite Information

Chemical Formula:

Al2[Al2.33][Si3AlO10](OH)8

Composition:

Molecular Weight = 524.20 gm

Aluminum 27.45 % Al 51.87 % Al₂O₃

Silicon 16.07 % Si 34.39 % SiO₂

Hydrogen 1.54 % H 13.75 % H₂O

Oxygen 54.94 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al_5.333Si₃O₁₀(OH)₈

Environment:

Hydrothermal alteration product of andalusite and spodumene.

IMA Status:

Valid Species (Pre-IMA) 1940

Locality:

Utrennyaia shaft and Uralskaya vein, Nagolyn area, Donbass region, Ukraine. Link to MinDat.org Location Data.

Name Origin:

Named in 1940 for the location.

Synonym:

Chloritite alpha

Donbassite Image

Images:

Donbassite

Comments: Translucent white crystalline donbassite.
Location: Donetz Basin, Ukraine. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Donbassite Crystallography

Axial Ratios:

a:b:c =0.5771:1:1.5827

Cell Dimensions:

a = 5.16, b = 8.94, c = 14.15, Z = 2; beta = 93.83° V = 651.29 Den(Calc)= 2.67

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.33(1), 4.71(1), 3.98(0.9),7.06(0.7), 3.53(0.6), 14.1(0.6), 2.52(0.5), 4.48(0.5),

Physical Properties of Donbassite

Cleavage:

[001] Perfect

Color:

White, Greenish white, Yellowish white.

Density:

2.63 - 2.64, Average = 2.63

Fracture:

Elastic - Fragments which spring back after bending.

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Pearly

Streak:

white

Optical Properties of Donbassite

Gladstone-Dale:

CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2156,KPDmeas= 0.2185,KC= 0.2256

Optical Data:

Biaxial (+), a=1.56-1.578, b=1.566-1.582, g=1.572-1.596, bire=0.0120-0.0180, 2V(Calc)=58-88, 2V(Meas)=48-55. Dispersion r > v.

Calculated Properties of Donbassite

Electron Density:

r_electron=2.65 gm/cc
note: r_Donbassite=2.64 gm/cc.

Fermion Index

Fermion Index = 0.00777
Boson Index = 0.99223

Photoelectric:

PE_Donbassite= 1.45 barns/electron
U=PE_Donbassite x r_electron= 3.84 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Donbassite is Not Radioactive

Donbassite Classification

Dana Class:

71.4.1.1 (71)Phyllosilicate Sheets of Six-Membered Rings

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

(71.4.1)Chlorite group (Tri-Dioctahedral)

71.4.1.1 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m

71.4.1.2 Cookeite LiAl4(Si3Al)O10(OH)8 P 2₁/a 2/m

71.4.1.3 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

71.4.1.4 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.4.1.5 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.4.1.6 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

71.4.1.7 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

71.4.1.8 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.4.1.9 Orthochamosite! (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

71.4.1.10 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

Strunz Class:

VIII/HX.00-00 VIII - Silicates

VIII/HX - Unclassified Strunz Phyllosilicates

VIII/HX.00 - Chlorite Group

Other Donbassite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Donbassite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - MinMax(Deutsch)
10 - MinMax(English)
11 - Mineralienatlas (Deutsch)
12 - QUT Mineral Atlas
13 - Ruff.Info

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

Donbassite

Al2[Al2.33][Si3AlO10](OH)8
Dana No: 71.4.1.1 Strunz No: VIII/HX.00-00
Locality:

Notes: