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Chromceladonite Mineral Data

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General Chromceladonite Information

Help on Chemical  Formula: Chemical Formula: KCrMg(Si4O10)(OH)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: KCrMgSi4O10(OH)2
Help on Environment: Environment: Matasomatic-hydrothermal mineral in a U-V deposit. Cr-analogue of celadonite
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Padma uranium-vanadium deposit, southern Karelia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its Cr content and the relationship to celadonite.
Help on Synonym: Synonym: IMA1999-024

Chromceladonite Image

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Comments: Greenish gray, pearly aggregate of chromceladonite.
Location: Srednaja Padma, Onega Karelia, Russian Federation. Scale: Box Size 2 x 2 cm.
© Sonke Stolze / Systematic Minerals

Chromceladonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5787:1:1.1165
Help on Cell Dimensions: Cell Dimensions: a = 5.267, b = 9.101, c = 10.162, Z = 2; beta = 100.67° V = 478.69 Den(Calc)= 2.93
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: C 2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Emerald green, Dark green.
Help on Density: Density: 2.9
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: pale green

Optical Properties of Chromceladonite

Help on Gladstone-Dale: 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
Ncalc = 1.6 - 1.61
Help on Optical Data: Optical Data: Biaxial (-), a=1.605, b=1.648, g=1.654, bire=0.0490

Calculated Properties of Chromceladonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.90 gm/cc
note: Specific Gravity of Chromceladonite =2.93 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEChromceladonite = 4.79 barns/electron
U=PEChromceladonite x relectron= 13.92 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 132.57 (Gamma Ray American Petroleum Institute Units)
Concentration of Chromceladonite per GRapi unit = 0.75 (%)

Estimated Radioactivity from Chromceladonite - barely detectable


Chromceladonite Classification

Help on  Dana Class: Dana Class: 71.02.02a.06e (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.02)with 2:1 Layers
  (71.02.02a)Mica Group (Muscovite subgroup)
71.02.02a.01 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m
71.02.02a.02 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono
71.02.02a.03 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m
71.02.02a.04 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m
71.02.02a.05 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m
71.02.02a.06 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m
71.02.02a.06b Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m
71.02.02a.06c Ferroaluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m
71.02.02a.06d Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m
71.02.02a.06e Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2
71.02.02a.07 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m
71.02.02a.08 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m
71.02.02a.09 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m
71.02.02a.10 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m
71.02.02a.11 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m
71.02.02a.12 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.EC.15 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
09.EC.15 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m
09.EC.15 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m
09.EC.15 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m
09.EC.15 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m
09.EC.15 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m
09.EC.15 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m
09.EC.15 Ferroaluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m
09.EC.15 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m
09.EC.15 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m
09.EC.15 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m
09.EC.15 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m
09.EC.15 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m
09.EC.15 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m
09.EC.15 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono
09.EC.15 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m
09.EC.15 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2
09.EC.15 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m

Other Chromceladonite Information

Help on References: References: NAME( AmMin, v 86, p 376) PHYS. PROP.(AmMin, v 86, p 376) OPTIC PROP.(AmMin, v 86, p 376)
Help on See Also: See Also: Links to other databases for Chromceladonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: 71.02.02a.06e Strunz No: 09.EC.15





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