Chromceladonite Mineral Data

Chromceladonite Mineral Data

General Chromceladonite Information

Chemical Formula:

KCrMg(Si4O10)(OH)2

Composition:

Molecular Weight = 421.75 gm

Potassium 9.27 % K 11.17 % K₂O

Magnesium 5.76 % Mg 9.56 % MgO

Chromium 12.33 % Cr 16.12 % CrO

Silicon 26.64 % Si 56.99 % SiO₂

Hydrogen 0.48 % H 4.27 % H₂O

Oxygen 45.52 % O

______ ______

100.00 % 98.10 % = TOTAL OXIDE

Empirical Formula:

KCrMgSi₄O₁₀(OH)₂

Environment:

Matasomatic-hydrothermal mineral in a U-V deposit. Cr-analogue of celadonite

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Padma uranium-vanadium deposit, southern Karelia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for its Cr content and the relationship to celadonite.

Synonym:

IMA1999-024

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Chromceladonite Crystallography

Axial Ratios:

a:b:c =0.5787:1:1.1165

Cell Dimensions:

a = 5.267, b = 9.101, c = 10.162, Z = 2; beta = 100.67° V = 478.69 Den(Calc)= 2.93

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: C 2

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

By Intensity(I/I_o): 2.588(1)(131), 4.54(0.93)(020), 2.409(0.87)(132), 3.638(0.64)(112), 1.518(0.58)(331), 3.097(0.51)(112), 4.36(0.4)(111), 2.583(0

Physical Properties of Chromceladonite

Cleavage:

[001] Perfect

Color:

Emerald green, Dark green.

Density:

2.9

Diaphaniety:

Transparent

Fracture:

Flexible - Flexible fragments.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Vitreous - Silky

Streak:

pale green

Optical Properties of Chromceladonite

Gladstone-Dale:

CI meas= -0.061 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.217,KPDmeas= 0.2192,KC= 0.2066

Optical Data:

Biaxial (-), a=1.605, b=1.648, g=1.654, bire=0.0490

Calculated Properties of Chromceladonite

Electron Density:

r_electron=2.90 gm/cc
note: r_{Chromceladonite}=2.93 gm/cc.

Fermion Index

Fermion Index = 0.03014
Boson Index = 0.96986

Photoelectric:

PE_{Chromceladonite}= 4.79 barns/electron
U=PE_{Chromceladonite} x r_electron= 13.92 barns/cc.

Radioactivity:

GRapi = 132.57 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Chromceladonite - barely detectable

Chromceladonite Classification

Dana Class:

71.2.2a.6e (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.10-35 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 Chromceladonite Information

References:

NAME( AmMin, v 86, p 376) PHYS. PROP.(AmMin, v 86, p 376) OPTIC PROP.(AmMin, v 86, p 376)

See Also:

Links to other databases for Chromceladonite :
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

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

Chromceladonite

KCrMg(Si4O10)(OH)2
Dana No: 71.2.2a.6e Strunz No: VIII/H.10-35
Locality:

Notes: