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Roscoelite

Big Photo

Val Graveglia (Gambatesa) Mine, Reppia, Graveglia Valley, Ne, Genova Province, Liguria, Italy
© G. Armellino

Show Roscoelite Photos (3)
Formula:
K(V,Al)
 
2
[(OH)
 
2
|AlSi
 
3
O
 
10
]
System:MonoclinicColour:Brown, dark green to ...
Hardness:2½
Name:Named after Henry Enfield Roscoe, Professor of Chemistry.


Mica Group

Classification of Roscoelite

IMA status:Approved
Strunz 8th edition ID:8/H.10-90
Nickel-Strunz 10th (pending) edition ID:9.EC.15

9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
Dana 8th edition ID:71.2.2a.4

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
Hey's CIM Ref.:16.15.1

16 : Silicates Containing Aluminum and other Metals
15 : Aluminosilicates of V and Cr
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Type Occurrence of Roscoelite

Type Locality:Stuckslager Mine (Stuckslacker Mine), Coloma, El Dorado Co., California, USA
Year of Discovery:1876

Physical Properties of Roscoelite

Lustre:Pearly
Diaphaneity (Transparency):Translucent
Colour:Brown, dark green to black
Hardness (Mohs):2½

Crystallography of Roscoelite

Crystal System:Monoclinic
Cell Parameters:a = 5.3Å, b = 9.2Å, c = 10.2Å
β = 100.55°
Ratio:a:b:c = 0.576 : 1 : 1.109
Unit Cell Volume:V 488.94 ų (Calculated from Unit Cell)

Optical Data of Roscoelite

Type:Biaxial (-)
RI values: nα = 1.590 - 1.610 nβ = 1.630 - 1.685 nγ = 1.640 - 1.704
Maximum Birefringence:δ = 0.050 - 0.094

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v weak

Chemical Properties of Roscoelite

Formula:
K(V,Al)
 
2
[(OH)
 
2
|AlSi
 
3
O
 
10
]
Essential elements:Al, H, K, O, Si, V
All elements listed in formula:Al, H, K, O, Si, V
Common Impurities:Fe,Ca,Na,H2O

Relationship of Roscoelite to other Species

Related to:
  • Mica Group
    • Related Minerals - Nickel-Strunz Grouping):
    9.EC.05Minnesotaite
    (Fe,Mg)
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    9.EC.05Talc
    Mg
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    9.EC.05Willemseite
    (Ni,Mg)
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    9.EC.10Ferripyrophyllite
    Fe
     
    2
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    9.EC.10Pyrophyllite
    Al
     
    2
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    9.EC.15Boromuscovite
    KAl
     
    2
    		[(OH)
     
    2
    		|BSi
     
    3
    		O
     
    10
    		]
    9.EC.15Celadonite
    K(Mg,Fe
    2+
     
    		)(Fe
    3+
     
    		,Al)[(OH)
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
    9.EC.15Chernykhite
    (Ba,Na)(V
    3+
     
    		,Al,Mg)
     
    2
    		[(OH)
     
    2
    		|(Si,Al)
     
    4
    		O
     
    10
    		]
    9.EC.15Montdorite
    (K,Na)
     
    2
    		(Fe
    2+
     
    		,Mn
    2+
     
    		,Mg)
     
    5
    		[(OH,F)
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
     
    2
    9.EC.15Muscovite
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.15Nanpingite
    CsAl
     
    2
    		[(OH,F)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.15Paragonite
    NaAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.15Tobelite
    (NH
     
    4
    		,K)Al
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.15Aluminoceladonite
    K(Mg,Fe
    2+
     
    		)(Al,Fe
    3+
     
    		)[(OH)
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
    9.EC.15Chromphyllite
    K(Cr,Al)
     
    2
    		[(OH,F)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.15Ferro-aluminoceladonite
    K(Fe
    2+
     
    		,Mg)(Al,Fe
    3+
     
    		)[(OH)
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
    9.EC.15Ferroceladonite
    K(Fe
    2+
     
    		,Mg)(Fe
    3+
     
    		,Al)[(OH)
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
    9.EC.15Chromceladonite
    K(Mg,Fe
    2+
     
    		)(Cr,Al)[(OH)
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
    9.EC.15Tainiolite
    KLiMg
     
    2
    		[F
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
    9.EC.15Ganterite
    (Ba,Na,K)(Al,Mg)
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.20Annite
    KFe
    2+
    3
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.20Biotite
    9.EC.20Ephesite
    NaLiAl
     
    2
    		[(OH)
     
    2
    		|Al
     
    2
    		Si
     
    2
    		O
     
    10
    		]
    9.EC.20Hendricksite
    K(Zn,Mg,Mn
    2+
     
    		)
     
    3
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.20Masutomilite
    (K,Rb)(Li,Mn
    3+
     
    		,Al)
     
    3
    		[(F,OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.20Norrishite
    KLiMn
    2+
    2
    		[(OH)
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
    9.EC.20Phlogopite
    KMg
     
    3
    		[(OH,F)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.20Polylithionite
    KLi
     
    2
    		Al[(F,OH)
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
    9.EC.20Preiswerkite
    NaMg
     
    2
    		Al[(OH)
     
    2
    		|Al
     
    2
    		Si
     
    2
    		O
     
    10
    		]
    9.EC.20Siderophyllite
    KFe
    2+
    2
    		Al[(F,OH)
     
    2
    		|Al
     
    2
    		Si
     
    2
    		O
     
    10
    		]
    9.EC.20Tetra-ferriphlogopite
    KMg
     
    3
    		[(OH,F)
     
    2
    		|(Fe
    3+
     
    		,Al)Si
     
    3
    		O
     
    10
    		]
    9.EC.20Wonesite
    (Na,K)(Mg,fe,Al)
     
    6
    		(Al,Si)
     
    8
    		O
     
    20
    		(OH,F)
     
    4
    9.EC.20Zinnwaldite
    KLiFe
    2+
     
    		Al[(F,OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.20Eastonite
    KMg
     
    2
    		Al[(OH)
     
    2
    		|Al
     
    2
    		Si
     
    2
    		O
     
    10
    		]
    9.EC.20Tetraferriannite
    KFe
    2+
    3
    		[(OH)
     
    2
    		|(Fe
    3+
     
    		,Al)Si
     
    3
    		O
     
    10
    		]
    9.EC.20Trilithionite
    K(Li,Al)
     
    3
    		[(F,OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.20Fluorannite
    KFe
    2+
    3
    		[(F,OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.20Shirokshinite
    KNaMg
     
    2
    		[F
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
    9.EC.20Shirozulite
    K(Mn
    2+
     
    		,Mg)
     
    3
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.20Sokolovaite
    CsLi
     
    2
    		AlSi
     
    4
    		O
     
    10
    		F
     
    2
    9.EC.20Aspidolite
    NaMg
     
    3
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.20Fluorophlogopite
    KMg
     
    3
    		[(F,OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.25Brammallite
    Na
     
    0.65
    		Al
     
    2.0
    		ٱAl
     
    0.65
    		Si
     
    3.35
    		O
     
    10
    		(OH)
     
    2
    9.EC.30Margarite
    CaAl
     
    2
    		[(OH)
     
    2
    		|Al
     
    2
    		Si
     
    2
    		O
     
    10
    		]
    9.EC.35Anandite
    (Ba,K)(Fe
    2+
     
    		,Mg)
     
    3
    		[(O,OH)
     
    2
    		|(Si,Al,Fe)
     
    4
    		O
     
    10
    		]
    9.EC.35Bityite
    CaLiAl
     
    2
    		[(OH)
     
    2
    		|BeAlSi
     
    2
    		O
     
    10
    		]
    9.EC.35Clintonite
    Ca(Mg,Al)
     
    3
    		[(OH)
     
    2
    		|Al
     
    3
    		SiO
     
    10
    		]
    9.EC.35Kinoshitalite
    (Ba,K)(Mg,Mn
    2+
     
    		,Al)
     
    3
    		[(OH)
     
    2
    		|Al
     
    2
    		Si
     
    2
    		O
     
    10
    		]
    9.EC.35Ferrokinoshitalite
    (Ba,K)(Fe
    2+
     
    		,Mg)
     
    3
    		[(OH,F)
     
    2
    		|Al
     
    2
    		Si
     
    2
    		O
     
    10
    		]
    9.EC.35Oxykinoshitalite
    (Ba,K)(Mg,Ti,Fe
    3+
     
    		,Fe
    2+
     
    		)
     
    3
    		[(O,OH,F)
     
    2
    		|(Si,Al)
     
    4
    		O
     
    10
    		]
    9.EC.40Beidellite
    (Na,Ca
     
    0.5
    		)
     
    0.3
    		Al
     
    2
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·nH
     
    2
    		O
    9.EC.40Kurumsakite
    (Zn,Ni,Cu)
     
    8
    		Al
     
    8
    		V
     
    2
    		Si
     
    5
    		O
     
    35
    		·27H
     
    2
    		O (or near)
    9.EC.40Montmorillonite
    (Na,Ca)
     
    0.33
    		(Al,Mg)
     
    2
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·nH
     
    2
    		O
    9.EC.40Nontronite
    Na
     
    0.3
    		Fe
     
    2
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·nH
     
    2
    		O
    9.EC.40Volkonskoite
    Ca
     
    0.3
    		(Cr,Mg,Fe)
     
    2
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·4H
     
    2
    		O
    9.EC.40Yakhontovite
    (Ca,Na)
     
    0.5
    		(Cu,Fe,Mg)
     
    2
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·3H
     
    2
    		O
    9.EC.40Smectite
    9.EC.45Hectorite
    Na
     
    0.3
    		(Mg,Li)
     
    3
    		Si
     
    4
    		O
     
    10
    		(F,OH)
     
    2
    9.EC.45Saponite
    Ca
     
    0.25
    		(Mg,Fe)
     
    3
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·nH
     
    2
    		O
    9.EC.45Sauconite
    Na
     
    0.3
    		Zn
     
    3
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·4H
     
    2
    		O
    9.EC.45Spadaite
    MgSiO
     
    2
    		(OH)
     
    2
    		·H
     
    2
    		O
    9.EC.45Stevensite
    (Ca,Na)
     
    x
    		Mg
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    9.EC.45Swinefordite
    Li(Al,Li,Mg)
     
    4
    		(Si,Al)
     
    8
    		O
     
    20
    		,(OH,F)
     
    4
    		·xH
     
    2
    		O
    9.EC.45Zincsilite
    Zn
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·4H
     
    2
    		O
    9.EC.45Ferrosaponite
    Ca
     
    0.3
    		(Fe
    2+
     
    		,Mg,Fe
    3+
     
    		)
     
    3
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·4H
     
    2
    		O
    9.EC.50Vermiculite
    (Mg,Fe,Al)
     
    3
    		(Al,Si)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·4H
     
    2
    		O
    9.EC.55Baileychlore
    (Zn,Fe,Al,Mg)
     
    6
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    8
    9.EC.55Chamosite
    (Fe
    2+
     
    		,Mg)
     
    5
    		Al[(OH)
     
    8
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.55Clinochlore
    (Mg,Fe
    2+
     
    		)
     
    5
    		Al[(OH)
     
    8
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.55Cookeite
    LiAl
     
    4
    		(Si
     
    3
    		Al)O
     
    10
    		(OH)
     
    8
    9.EC.55Franklinfurnaceite
    Ca
     
    2
    		FeMn
     
    3
    		MnZn
     
    2
    		Si
     
    2
    		O
     
    10
    		(OH)
     
    8
    9.EC.55Gonyerite
    (Mn,Mg)
     
    5
    		Fe(Si
     
    3
    		Fe)O
     
    10
    		(OH)
     
    8
    9.EC.55Nimite
    (Ni,Mg,Al)
     
    6
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    8
    9.EC.55Orthochamosite
    (Fe,Mg,Fe)
     
    5
    		Al(Si
     
    3
    		Al)O
     
    10
    		(OH,O)
     
    8
    9.EC.55Pennantite
    (Mn
     
    5
    		Al)(Si
     
    3
    		Al)O
     
    10
    		(OH)
     
    8
    9.EC.55Sudoite
    (Mg,Fe
    2+
     
    		)
     
    2
    		Al
     
    3
    		[(OH)
     
    8
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.55Donbassite
    Al
     
    2
    		[Al
     
    2.33
    		][Si
     
    3
    		AlO
     
    10
    		](OH)
     
    8
    9.EC.55Glagolevite
    Na(Mg,Al)
     
    6
    		[(OH,O)
     
    8
    		|AlSi
     
    3
    		O
     
    10
    		]
    9.EC.55Borocookeite
    Li
     
    1+3x
    		Al
     
    4-x
    		[(BSi
     
    3
    		)O
     
    10
    		](OH)
     
    8
    		 [0.00 <= x <=0.33]
    9.EC.60Aliettite
    Ca
     
    0.2
    		Mg
     
    6
    		(Si,Al)
     
    8
    		O
     
    20
    		(OH)
     
    4
    		·4H
     
    2
    		O
    9.EC.60Corrensite
    (Mg,Fe)
     
    9
    		(Si,Al)
     
    8
    		O
     
    20
    		(OH)
     
    10
    		·nH
     
    2
    		O
    9.EC.60Dozyite
    Mg
     
    7
    		Al
     
    2
    		[(OH)
     
    12
    		|Al
     
    2
    		Si
     
    4
    		O
     
    15
    		]
    9.EC.60Hydrobiotite
    9.EC.60Karpinskite
    (Ni,Mg)
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    2
    9.EC.60Kulkeite
    Mg
     
    8
    		Al(AlSi
     
    7
    		)O
     
    20
    		(OH)
     
    10
    9.EC.60Lunijianlaite
    Li
     
    0.7
    		Al
     
    6.2
    		(Si
     
    7
    		AlO
     
    20
    		)(OH,O)
     
    10
    9.EC.60Rectorite
    (Na,Ca)Al
     
    4
    		(Si,Al)
     
    8
    		O
     
    20
    		(OH)
     
    4
    		·2H
     
    2
    		O
    9.EC.60Saliotite
    Li
     
    0.5
    		Na
     
    0.5
    		Al
     
    3
    		Si
     
    3
    		AlO
     
    10
    		(OH)
     
    5
    9.EC.60Tosudite
    9.EC.60Brinrobertsite
    Na
     
    0.3
    		Al
     
    4
    		[(OH)
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
     
    2
    		 · 3.5 H
     
    2
    		O
    9.EC.65Macaulayite
    (Fe,Al)
     
    24
    		Si
     
    4
    		O
     
    43
    		(OH)
     
    2
    9.EC.70Burckhardtite
    Pb
     
    2
    		(Fe,Mn)AlTeO
     
    2
    		Si
     
    3
    		O
     
    10
    		(OH)
     
    2
    		·H
     
    2
    		O
    9.EC.75Ferrisurite
    (Pb,Ca)
     
    2-3
    		(CO
     
    3
    		)
     
    1.5-2
    		(OH,F)
     
    0.5-1
    		[(Fe,Al)
     
    2
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    		]·nH
     
    2
    		O
    9.EC.75Surite
    Pb(Pb,Ca)(CO
     
    3
    		)
     
    2
    		(Al,Fe,Mg)
     
    2
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    2
    9.EC.75Niksergievite
    (Ba,Ca)
     
    2
    		(Al,Si)
     
    7
    		O
     
    10
    		(CO
     
    3
    		)(OH)
     
    6
    		·nH
     
    2
    		O
    9.EC.80Kegelite
    Pb
     
    12
    		(Zn,Fe)
     
    2
    		Al
     
    4
    		(SO
     
    4
    		)
     
    4
    		Si
     
    11
    		O
     
    38
    		 or near
    Related Minerals - Hey's Index Grouping:
    16.15.2Mukhinite
    {Ca
     
    2
    		}{Al
     
    2
    		V
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    16.15.3Chernykhite
    (Ba,Na)(V
    3+
     
    		,Al,Mg)
     
    2
    		[(OH)
     
    2
    		|(Si,Al)
     
    4
    		O
     
    10
    		]
    16.15.4Rilandite
    Cr
     
    4
    		Al
     
    2
    		SiO
     
    11
    		·5H
     
    2
    		O or near
    16.15.5Shuiskite
    Ca
     
    2
    		(Mg,Al)(Cr,Al)
     
    2
    		[(OH)
     
    2
    		|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		] · 2H
     
    2
    		O
    16.15.6Volkonskoite
    Ca
     
    0.3
    		(Cr,Mg,Fe)
     
    2
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·4H
     
    2
    		O

    Other Names for Roscoelite

    Synonyms:
    Colomite
    German names:
    ColomitRoscoelit
    Spanish names:
    ColomitaRoscoelita

    Polytypes for Roscoelite

    Polytypes:
    Roscoelite-1M

    Other Information

    Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

    References for Roscoelite

    Reference List:Hanks, Henry Garber (1881), Notes on roscoelite: Mining and Scientific Press: 42: 428.

    Wright, F.E. (1914), The optical properties of roscoelite: American Journal of Science, 4th. series: 38: 305-308;

    Canadian Mineralogist (1998): 36: 905-912.

    Internet Links for Roscoelite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Roscoelite in the Natural History Museum (London) online catalogue
  • Roscoelite details from Handbook of Mineralogy (PDF)
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    Localities for Roscoelite

    Show Locality List (211 Items)
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