Roscoelite
A valid IMA mineral species - grandfathered
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About Roscoelite
Formula:
K(V3+,Al)2(AlSi3O10)(OH)2
Colour:
Brown, dark green to black
Lustre:
Pearly
Hardness:
2½
Specific Gravity:
2.92 - 2.94
Crystal System:
Monoclinic
Member of:
Name:
For Sir Henry Enfield Roscoe, FRS (7 January 1833 - 18 December 1915), an English chemist particularly noted for early work on vanadium and for photochemical studies.
Unique Identifiers
Mindat ID:
3449
Long-form identifier:
mindat:1:1:3449:0
GUID
(UUID V4):
(UUID V4):
216f9772-0f9d-4766-9b83-b16923a5a72f
IMA Classification of Roscoelite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
KV3+2(Si3Al)O10(OH)2
First published:
1876
Classification of Roscoelite
9.EC.15
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
71.2.2a.4
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
16.15.1
16 : Silicates Containing Aluminum and other Metals
15 : Aluminosilicates of V and Cr
16 : Silicates Containing Aluminum and other Metals
15 : Aluminosilicates of V and Cr
Mineral Symbols
As of 2021 there are now IMAβCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMAβCNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMAβCNMNC symbol. Older variants are listed for historical use only.
Symbol | Source | Reference |
---|---|---|
Rcl | IMAβCNMNC | Warr, L.N. (2021). IMAβCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Rcl | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Roscoelite
Pearly
Transparency:
Transparent, Translucent
Colour:
Brown, dark green to black
Streak:
Gray
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
on {001}
on {001}
Density:
2.92 - 2.94 g/cm3 (Measured) 2.89 g/cm3 (Calculated)
Optical Data of Roscoelite
Type:
Biaxial (-)
RI values:
nα = 1.590 - 1.610 nβ = 1.630 - 1.685 nγ = 1.640 - 1.704
2V:
Measured: 24.5° to 39.5°
Max Birefringence:
δ = 0.050 - 0.094
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak
Pleochroism:
Visible
Comments:
X = green-brown; Y = Z = olive-green.
Chemistry of Roscoelite
Mindat Formula:
K(V3+,Al)2(AlSi3O10)(OH)2
Common Impurities:
Fe,Ca,Na,H2O
Crystallography of Roscoelite
Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Roscoelite-1M | Roscoelite-2M1 |
---|---|
Monoclinic | |
2/m - Prismatic | |
B2/m | |
C2/m | |
a = 5.292(1) Å, b = 9.131(2) Å, c = 10.206 Å β = 100.98(2)° | |
a:b:c = 0.58 : 1 : 1.118 | |
V 484.14 Γ
Β³ (Calculated from Unit Cell) | |
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
10.0 Γ | (100) |
4.54 Γ | (80) |
3.35 Γ | (80) |
2.60 Γ | (80) |
1.52 Γ | (60) |
3.66 Γ | (50) |
3.11 Γ | (50) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47e : [Vanadates, chromates, manganates] | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
50 : Coal and/or oil shale minerals | <0.36 |
Geological Setting:
Low temperature epithermal Au-Ag-Te deposits and oxidized portions of sedimentary U-V deposits.
Type Occurrence of Roscoelite
General Appearance of Type Material:
Radiating and foliated talc-like masses.
Place of Conservation of Type Material:
MusΓ©um Nationale dβHistoire Naturelle, Paris, France, number 132.198 (type).
Geological Setting of Type Material:
Filling cavities in a schistose porphyry.
Associated Minerals at Type Locality:
Synonyms of Roscoelite
Other Language Names for Roscoelite
Russian:Π ΠΎΡΠΊΠΎΠ»ΠΈΡ
Simplified Chinese:ιδΊζ―
Spanish:Colomita
Roscoelita
Roscoelita
Traditional Chinese:ι©ι²ζ―
Relationship of Roscoelite to other Species
Member of:
Other Members of this group:
Boromuscovite | KAl2(BSi3O10)(OH)2 | Mon. 2/m |
Celadonite Subgroup | A subgroup of the dioctahedral mica group. | |
Chromphyllite | K(Cr,Al)2(AlSi3O10)(OH,F)2 | Mon. 2/m : B2/b |
Glauconite | K0.60-0.85(Fe3+,Mg,Al)2(Si,Al)4O10](OH)2 | |
Muscovite | KAl2(AlSi3O10)(OH)2 | Mon. 2/m : B2/b |
Nanpingite | CsAl2(AlSi3O10)(OH,F)2 | Mon. 2/m : B2/b |
Natro-glauconite | (Na,K)(Fe3+,Al,Mg)2((Si,Al)4O10)(OH)2 | |
Paragonite | NaAl2(AlSi3O10)(OH)2 | Mon. |
Tobelite | (NH4,K)Al2(AlSi3O10)(OH)2 | Mon. 2/m : B2/m |
Common Associates
Associated Minerals Based on Photo Data:
4 photos of Roscoelite associated with Nolanite | V3+8Fe3+2O14(OH)2 |
4 photos of Roscoelite associated with Bariandite | Al0.6(V5+,V4+)8O20 Β· 9H2O |
3 photos of Roscoelite associated with Hewettite | CaV6O16 Β· 9H2O |
3 photos of Roscoelite associated with Natalyite | NaV3+Si2O6 |
3 photos of Roscoelite associated with VΓ©signiΓ©ite | BaCu3(VO4)2(OH)2 |
2 photos of Roscoelite associated with Illite | K0.65Al2.0[Al0.65Si3.35O10](OH)2 |
2 photos of Roscoelite associated with Pascoite | Ca2Ca(V10O28) Β· 17H2O |
2 photos of Roscoelite associated with Gypsum | CaSO4 Β· 2H2O |
2 photos of Roscoelite associated with Bokite | (Al,Fe)1.3(V5+,V4+,Fe3+)8O20 Β· 7.5H2O |
2 photos of Roscoelite associated with Baryte | BaSO4 |
Related Minerals - Strunz-mindat Grouping
9.EC. | Balestraite | KLi2V5+Si4O12 |
9.EC. | Meifuite | KFe6(Si7Al)O19(OH)4Cl2 |
9.EC.05 | Minnesotaite | Fe2+3Si4O10(OH)2 |
9.EC.05 | Talc | Mg3Si4O10(OH)2 |
9.EC.05 | Willemseite | Ni3Si4O10(OH)2 |
9.EC.9.EC. | Voloshinite | Rb(LiAl1.5β»0.5)(Al0.5Si3.5)O10F2 |
9.EC.10 | Ferripyrophyllite | Fe3+Si2O5(OH) |
9.EC.10 | Pyrophyllite | Al2Si4O10(OH)2 |
9.EC.10 | Luanshiweiite | KLiAl1.5(Si3.5Al0.5)O10(OH)2 |
9.EC.10 | Fluorluanshiweiite | KLiAl1.5(Si3.5Al0.5)O10F2 |
9.EC.10 | Manganiceladonite | K(MgMn3+β»)(Si4O10)(OH)2 |
9.EC.10 | Garmite | CsLiMg2(Si4O10)F2 |
9.EC.10 | Gorbunovite | CsLi2(Ti,Fe)Si4O10(F,OH,O)2 |
9.EC.15 | Boromuscovite | KAl2(BSi3O10)(OH)2 |
9.EC.15 | Celadonite | K(MgFe3+β»)(Si4O10)(OH)2 |
9.EC.15 | Chernykhite | (Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2 |
9.EC.15 | Montdorite | (K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4 |
9.EC.15 | Muscovite | KAl2(AlSi3O10)(OH)2 |
9.EC.15 | Nanpingite | CsAl2(AlSi3O10)(OH,F)2 |
9.EC.15 | Paragonite | NaAl2(AlSi3O10)(OH)2 |
9.EC.15 | Tobelite | (NH4,K)Al2(AlSi3O10)(OH)2 |
9.EC.15 | Aluminoceladonite | K(MgAlβ»)(Si4O10)(OH)2 |
9.EC.15 | Chromphyllite | K(Cr,Al)2(AlSi3O10)(OH,F)2 |
9.EC.15 | Ferroaluminoceladonite | K(Fe2+Alβ»)(Si4O10)(OH)2 |
9.EC.15 | Ferroceladonite | K(Fe2+Fe3+β»)(Si4O10)(OH)2 |
9.EC.15 | Chromceladonite | K(MgCrβ»)(Si4O10)(OH)2 |
9.EC.15 | Tainiolite | KLiMg2(Si4O10)F2 |
9.EC.15 | Ganterite | (Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2 |
9.EC.15 | UM1988-22-SiO:AlCaFFeHKLiMg | KLiMgAl2Si3O10F2 |
9.EC.15 | Kreiterite | CsLi2Fe3+(Si4O10)F2 |
9.EC.20 | Annite | KFe2+3(AlSi3O10)(OH)2 |
9.EC.20 | Ephesite | NaLiAl2(Al2Si2O10)(OH)2 |
9.EC.20 | Hendricksite | KZn3(Si3Al)O10(OH)2 |
9.EC.20 | Masutomilite | (K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2 |
9.EC.20 | Norrishite | KLiMn3+2(Si4O10)O2 |
9.EC.20 | Phlogopite | KMg3(AlSi3O10)(OH)2 |
9.EC.20 | Polylithionite | KLi2Al(Si4O10)(F,OH)2 |
9.EC.20 | Preiswerkite | NaMg2Al(Al2Si2O10)(OH)2 |
9.EC.20 | Siderophyllite | KFe2+2Al(Al2Si2O10)(OH)2 |
9.EC.20 | Tetraferriphlogopite | KMg3(Fe3+Si3O10)(OH,F)2 |
9.EC.20 | Fluorotetraferriphlogopite | KMg3(Fe3+Si3O10)F2 |
9.EC.20 | Wonesite | (Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4 |
9.EC.20 | Eastonite | KMg2Al(Al2Si2O10)(OH)2 |
9.EC.20 | Tetraferriannite | KFe2+3(Si3Fe3+)O10(OH)2 |
9.EC.20 | Trilithionite | K(Li1.5Al1.5)(AlSi3O10)(F,OH)2 |
9.EC.20 | Fluorannite | KFe2+3(Si3Al)O10F2 |
9.EC.20 | Shirokshinite | K(NaMg2)(Si4O10)F2 |
9.EC.20 | Shirozulite | KMn2+3(Si3Al)O10(OH)2 |
9.EC.20 | Sokolovaite | CsLi2Al(Si4O10)F2 |
9.EC.20 | Aspidolite | NaMg3(AlSi3O10)(OH)2 |
9.EC.20 | Fluorophlogopite | KMg3(Si3Al)O10F2 |
9.EC.20 | UM2004-49-SiO:AlCsFHKLi | (Cs,K)(Al,Li)2.6((Si,Al)4O10)(F,OH)2 |
9.EC.20 | Suhailite | (NH4)Fe2+3(AlSi3O10)(OH)2 |
9.EC.20 | Yangzhumingite | KMg2.5(Si4O10)F2 |
9.EC.20 | Orlovite | KLi2Ti(Si4O10)OF |
9.EC.20 | Oxyphlogopite | K(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2 |
9.EC.20 | Chloroferrokinoshitalite | (Ba,K)(Fe2+,Mg)3(Al2Si2O10)(Cl,OH,F)2 |
9.EC.22 | Pimelite | Ni3Si4O10(OH)2 Β· 4H2O |
9.EC.30 | Chlorophaeite | (Ca,Mg,Fe)2Fe2Si4O13 Β· 10H2O |
9.EC.30 | Margarite | CaAl2(Al2Si2O10)(OH)2 |
9.EC.35 | Anandite | (Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2 |
9.EC.35 | Bityite | CaLiAl2(AlBeSi2O10)(OH)2 |
9.EC.35 | Clintonite | CaAlMg2(SiAl3O10)(OH)2 |
9.EC.35 | Kinoshitalite | (Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2 |
9.EC.35 | Ferrokinoshitalite | (Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2 |
9.EC.35 | Oxykinoshitalite | (Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2 |
9.EC.35 | Fluorokinoshitalite | BaMg3(Al2Si2O10)F2 |
9.EC.40 | Beidellite | (Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 Β· nH2O |
9.EC.40 | Kurumsakite | (Zn,Ni,Cu)8Al8V5+2Si5O35 Β· 27H2O (?) |
9.EC.40 | Montmorillonite | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 Β· nH2O |
9.EC.40 | Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 Β· nH2O |
9.EC.40 | Volkonskoite | Ca0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 Β· 4H2O |
9.EC.40 | Yakhontovite | (Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 Β· 3H2O |
9.EC.45 | Hectorite | Na0.3(Mg,Li)3(Si4O10)(F,OH)2 |
9.EC.45 | Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 Β· nH2O |
9.EC.45 | Sauconite | Na0.3Zn3((Si,Al)4O10)(OH)2 Β· 4H2O |
9.EC.45 | Spadaite | MgSiO2(OH)2 Β· H2O (?) |
9.EC.45 | Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 |
9.EC.45 | Swinefordite | Li(Al,Li,Mg)3((Si,Al)4O10)2(OH,F)4 Β· nH2O |
9.EC.45 | Zincsilite | Zn3Si4O10(OH)2 Β· 4H2O (?) |
9.EC.45 | Ferrosaponite | Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 Β· 4H2O |
9.EC.45 | Hanjiangite | Ba2CaV3+Al(H2AlSi3O12)(CO3)2F |
9.EC.50 | Vermiculite | Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 Β· 8H2O |
9.EC.52 | Tarasovite | near NaKAl11Si13O40(OH)9 Β· 3H2O |
9.EC.55 | Baileychlore | (Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8 |
9.EC.55 | Chamosite | (Fe2+)5Al(Si,Al)4O10(OH,O)8 |
9.EC.55 | Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
9.EC.55 | Cookeite | (LiAl4β»)[AlSi3O10](OH)8 |
9.EC.55 | Franklinfurnaceite | Ca2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8 |
9.EC.55 | Gonyerite | (Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8 |
9.EC.55 | Nimite | (Ni,Mg,Al)6((Si,Al)4O10)(OH)8 |
9.EC.55 | Orthochamosite | (Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8 |
9.EC.55 | Pennantite | Mn2+5Al(AlSi3O10)(OH)8 |
9.EC.55 | Sudoite | Mg2Al3(Si3Al)O10)(OH)8 |
9.EC.55 | Donbassite | Al4.33(Si3Al)O10(OH)8 |
9.EC.55 | Glagolevite | Na(Mg,Al)6(AlSi3O10)(OH,O)8 |
9.EC.55 | Borocookeite | (LiAl4β»)[BSi3O10](OH)8 |
9.EC.60 | Aliettite | Ca0.2Mg6((Si,Al)8O20)(OH)4 Β· 4H2O |
9.EC.60 | Corrensite | (Mg,Fe)9((Si,Al)8O20)(OH)10 Β· nH2O |
9.EC.60 | Dozyite | Mg7Al2(Al2Si4O15)(OH)12 |
9.EC.60 | Hydrobiotite | K(Mg,Fe2+)6((Si,Al)8O20)(OH)4 Β· nH2O |
9.EC.60 | Karpinskite | (Ni,Mg)2Si2O5(OH)2 (?) |
9.EC.60 | Kulkeite | Mg8Al(AlSi7O20)(OH)10 |
9.EC.60 | Lunijianlaite | Li0.7Al6.2(AlSi7O20)(OH,O)10 |
9.EC.60 | Rectorite | (Na,Ca)Al4((Si,Al)8O20)(OH)4 Β· 2H2O |
9.EC.60 | Saliotite | (Li,Na)Al3(AlSi3O10)(OH)5 |
9.EC.60 | Tosudite | Na0.5(Al,Mg)6((Si,Al)8O18)(OH)12 Β· 5H2O |
9.EC.60 | Brinrobertsite | Na0.3Al4(Si4O10)2(OH)4 Β· 3.5 H2O |
9.EC.65 | Macaulayite | (Fe,Al)24Si4O43(OH)2 |
9.EC.70 | Burckhardtite | Pb2(Fe3+Te6+)[AlSi3O8]O6 |
9.EC.75 | Ferrisurite | (Pb,Ca)2.4Fe3+2(Si4O10)(CO3)1.7(OH)3 Β· nH2O |
9.EC.75 | Surite | (Pb,Ca)3(Al,Fe2+,Mg)2((Si,Al)4O10)(CO3)2(OH)2 |
9.EC.75 | Niksergievite | (Ba,Ca)2Al3(AlSi3O10)(CO3)(OH)6 Β· nH2O |
9.EC.80 | Kegelite | Pb8Al4(Si8O20)(SO4)2(CO3)4(OH)8 |
Other Information
Thermal Behaviour:
Before the blowpipe, it fuses easily to a black glass, coloring the flame slightly pink.
Notes:
Only slightly affected by acids, even by boiling concentrated sulphuric acid. But readily decomposed by dilute sulphuric acid when heated in a sealed tube at a temperature of about 180Β°C.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Roscoelite
mindat.org URL:
https://www.mindat.org/min-3449.html
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References for Roscoelite
Reference List:
Roscoe, H. E. (1877) IV. On two new vanadium minerals. Proceedings of the Royal Society of London, 25 (171) 109-112 doi:10.1098/rspl.1876.0023
Localities for Roscoelite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
β - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Quick NavTopAbout RoscoeliteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Gambatesa Mine, Reppia, Ne, Genoa, Liguria, Italy