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Roscoelite

Formula:
K(V,Al)
 
2
[(OH)
 
2
|AlSi
 
3
O
 
10
]
System:MonoclinicColour:Brown, dark green to ...
Hardness:
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):

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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  • External Links:
  • Look for Roscoelite on Webmineral
  • Look for Roscoelite on Athena Mineralogy
  • Look for Roscoelite on Wikipedia
  • Look for Roscoelite on Mineralien Atlas
  • 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)
  • Mineral Dealers:
  • Buy Fine Minerals from mineralsweb.com
  • Search for Roscoelite at Thames Valley Minerals
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  • Wilensky Fine Minerals
  • rare and unusual minerals mainly crystallized
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    Localities for Roscoelite

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