Mineralogy Database

Roscoelite Mineral Data

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General Roscoelite Information

Help on Chemical  Formula: Chemical Formula: K(V,Al,Mg)2AlSi3O10(OH)2
Help on Composition: Composition: Molecular Weight = 411.01 gm
   Potassium   9.51 %  K    11.46 % K2O
   Magnesium   2.37 %  Mg    3.92 % MgO
   Aluminum   10.50 %  Al   19.85 % Al2O3
   Vanadium    9.92 %  V    17.70 % V2O5
   Silicon    20.50 %  Si   43.86 % SiO2
   Hydrogen    0.49 %  H     4.38 % H2O
   Oxygen     46.71 %  O
             ______        ______ 
             100.00 %      101.17 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KV5+0.8Al0.6Mg0.4AlSi3O10(OH)2
Help on Environment: Environment: An early stage gangue material in low-temperature epithermal Au-Ag-Te deposits and from the oxidized portions of sedimentary U-V ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1876
Help on Locality: Locality: Stuckslacker mine, 2 miles SW of Coloma, El Dorado Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Henry Enfield Roscoe (1833-1915) of Manchester, England who first prepared pure vanadium.
Help on Name Pronunciation: Name Pronunciation: Roscoelite + Pronunciation Say ROSCOELITE
 

Roscoelite Image

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  Roscoelite

Comments: Dull olive green fine grained roscoelite cementing sandstone.
Location: Rifle Mine, Garfield County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Zincochromite   Roscoelite

Comments: Roscoelite segregation filled with rich impregnation zincochromite microcrystals (up to 60 vol.%). Metallic-white grains of clausthalite are visible. Inset polished section image shows crystals of zincochromite in chromceladonite matrix.
Location: Srednyaya Padma U-V deposit, Zaonezhie peninsula, Lake Onega, Karelia Republic, Northern Region, Russia. Scale: Specimen size is 6x4x4 cm.
© Pavel M. Kartashov

Roscoelite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5786:1:1.1276
Help on Cell Dimensions: Cell Dimensions: a = 5.26, b = 9.09, c = 10.25, Z = 2; beta = 101° V = 481.08 Den(Calc)= 2.84
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10(1), 3.35(0.8), 4.54(0.8),
 

Physical Properties of Roscoelite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Brown green, Greenish brown, Yellow green, Dark brown, Dark green.
Help on Density: Density: 2.97
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Pearly
Help on Streak: Streak: greenish white
 

Optical Properties of Roscoelite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.089 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.047 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2265,KPDmeas= 0.2166,KC= 0.2377
Ncalc = 1.68 - 1.71
Help on Optical Data: Optical Data: Biaxial (-), a=1.59-1.61, b=1.63-1.685, g=1.64-1.704, bire=0.0500-0.0940
Help on Pleochroism (x): Pleochroism (x): green brown.
Help on Pleochroism (y): Pleochroism (y): olive green.
Help on Pleochroism (z): Pleochroism (z): olive green.
 

Calculated Properties of Roscoelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.81 gm/cc
note: Specific Gravity of Roscoelite =2.84 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PERoscoelite = 3.96 barns/electron
U=PERoscoelite x relectron= 11.10 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 135.57 (Gamma Ray American Petroleum Institute Units)
Concentration of Roscoelite per GRapi unit = 0.74 (%)

Estimated Radioactivity from Roscoelite - barely detectable

 

Roscoelite Classification

Help on  Dana Class: Dana Class: 71.02.02a.04 (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 Roscoelite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Roscoelite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - CalTech Mineral Spectroscopy
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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

Roscoelite

K(V,Al,Mg)2AlSi3O10(OH)2
Dana No: 71.02.02a.04 Strunz No: 09.EC.15
Locality:

 

Notes:

 

 
   
 


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