Chromphyllite Mineral Data

Chromphyllite Mineral Data

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General Chromphyllite Information

Chemical Formula:

(K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2

Composition:

Molecular Weight = 415.64 gm

Potassium 7.06 % K 8.50 % K₂O

Barium 8.26 % Ba 9.22 % BaO

Aluminum 8.11 % Al 15.33 % Al₂O₃

Chromium 9.38 % Cr 13.71 % Cr₂O₃

Silicon 20.27 % Si 43.37 % SiO₂

Hydrogen 0.36 % H 3.25 % H₂O

Oxygen 44.27 % O

Fluorine 2.29 % F 2.29 % F

- % F -0.96 % -O=F₂

______ ______

100.00 % 94.71 % = TOTAL OXIDE

Empirical Formula:

K_0.75Ba_0.25Cr_0.75Al_1.25Si₃O₁₀(OH)_1.5F_0.5

Environment:

Cr-enriched layers in quartz-diopside rocks.

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

Slyudyanka complex, Southern Lake Baikal region, Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

The name alludes to the composition and micaceous cleavage.

Synonym:

IMA1995-052

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Chromphyllite Crystallography

Axial Ratios:

a:b:c =0.5865:1:2.2601

Cell Dimensions:

a = 5.32, b = 9.07, c = 20.5, Z = 4; beta = 95.6° V = 984.45 Den(Calc)= 2.80

Crystal System:

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

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

By Intensity(I/I_o): 1.519(1), 2.6(1), 4.52(0.8),

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Physical Properties of Chromphyllite

Cleavage:

[001] Perfect

Color:

Emerald green.

Density:

2.88

Diaphaniety:

Transparent

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

whitish green

Optical Properties of Chromphyllite

Gladstone-Dale:

CI meas= -0.122 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.154 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2335,KPDmeas= 0.227,KC= 0.2023

Optical Data:

Biaxial (-), a=1.619, b=1.669, g=1.673, bire=0.0540, 2V(Calc)=30, 2V(Meas)=31. Dispersion r > v distinct.

Calculated Properties of Chromphyllite

Electron Density:

r_electron=2.81 gm/cc
note: r_{Chromphyllite}=2.88 gm/cc.

Fermion Index

Fermion Index = 0.03332
Boson Index = 0.96668

Photoelectric:

PE_{Chromphyllite}= 37.86 barns/electron
U=PE_{Chromphyllite} x r_electron= 106.25 barns/cc.

Radioactivity:

GRapi = 99.20 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Chromphyllite - barely detectable

Chromphyllite Classification

Dana Class:

71.2.2a.11 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2a)Mica Group (Muscovite subgroup)

71.2.2a.1 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m

71.2.2a.2 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono

71.2.2a.3 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m

71.2.2a.4 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m

71.2.2a.5 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m

71.2.2a.6 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m

71.2.2a.6b Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m

71.2.2a.6c Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m

71.2.2a.6d Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m

71.2.2a.6e Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2

71.2.2a.7 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m

71.2.2a.8 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m

71.2.2a.9 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m

71.2.2a.10 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

71.2.2a.11 Chromphyllite ! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m

71.2.2a.12 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m

Strunz Class:

VIII/H.10-80 VIII - Silicates

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

VIII/H.10 - Mica group, Muscovite series

VIII/H.10-10 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m

VIII/H.10-20 Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m

VIII/H.10-30 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m

VIII/H.10-35 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2

VIII/H.10-40 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m

VIII/H.10-50 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono

VIII/H.10-60 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m

VIII/H.10-70 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m

VIII/H.10-80 Chromphyllite (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m

VIII/H.10-90 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m

VIII/H.10-95 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m

VIII/H.10-100 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m

VIII/H.10-110 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m

Other Chromphyllite Information

References:

NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.83,p652,1998) OPTIC PROP.(AmMin)

See Also:

Links to other databases for Chromphyllite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Chromphyllite

(K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2
Dana No: 71.2.2a.11 Strunz No: VIII/H.10-80
Locality:

Notes: