Roscoelite  Mineral Data

Roscoelite Mineral Data

Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About


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

Click Here for Larger Roscoelite Image in a New Browser Window Images:
Click Here for Larger Roscoelite Image

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

Click Here for Larger Roscoelite Image in a New Browser Window Images:
Click Here for Larger Roscoelite Image

Roscoelite   Zincochromite

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 - PrismaticH-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

Search for Roscoelite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Roscoelite :

A Bijoux Google Search for Roscoelite
Adam's Minerals Google Search for Roscoelite
Cape Minerals Google Search for Roscoelite
Dakota Matrix Minerals Google Search for Roscoelite
Excalibur Mineral Corp. Google Search for Roscoelite
Exceptional Minerals Google Search for Roscoelite
John Betts Fine Minerals Search for Roscoelite
McDougall Minerals Google Search for Roscoelite
Mineral News Website Link
Rock and Mineral Shows Google Search for Roscoelite
Weinrich Minerals, Inc. Google Search for Roscoelite

Ask about Roscoelite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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: