Redgillite Mineral Data

General Redgillite Information

Chemical Formula:

Cu6(OH)10(SO4)•H2O

Composition:

Molecular Weight = 665.25 gm

Copper 57.27 % Cu 71.68 % CuO

Hydrogen 1.82 % H 16.24 % H₂O

Sulfur 4.83 % S 12.07 % SO₃

Oxygen 36.08 % O

______ ______

100.00 % 99.99 % = TOTAL OXIDE

Empirical Formula:

Cu_5.99(OH)_9.99(SO₄)•(H₂O)

Environment:

Found in thin fractures of partly oxidized sulphides. Langite group

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Silver Gill mine, Cumbria, United Kingdom Link to MinDat.org Location Data.

Name Origin:

Named for the Red Gill mine.

Synonym:

IMA2004-016

Redgillite Image

Images:

Redgillite

Comments: Light green acicular microcrystals of redgillite with unidentified blue Cu sulphate on matrix.
Location: Grube Schone Aussicht, Siegerland, Germany. Scale: Picture size 2 mm.
© Diederik Visser

Redgillite Crystallography

Axial Ratios:

a:b:c =0.3021:1:1.8615

Cell Dimensions:

a = 3.155, b = 10.441, c = 19.436, Z = 2; beta = 90.089° V = 640.25 Den(Calc)= 3.45

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.11(1)(100,012 ), 9.72(0.9)(90,002 ), 2.318(0.5)(15,008 ),2.88(0.3)(30,112,112), 4.6(0.3)(30,022 ), 4.068(0.2)(20,023 ), 1.941(0.15)(15,141,141), 2(0.15)(50,1

Physical Properties of Redgillite

Cleavage:

{001} Perfect, {100} Good, {010} Good

Color:

Grass green.

Density:

3.45

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Redgillite

Gladstone-Dale:

CI meas= -0.041 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.041 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2065,KPDmeas= 0.2065,KC= 0.1984
Ncalc = 1.68

Optical Data:

Biaxial (-), a=1.693, b=1.721, g=1.723, bire=0.0300

Calculated Properties of Redgillite

Electron Density:

Bulk Density (Electron Density)=3.34 gm/cc
note: Specific Gravity of Redgillite =3.45 gm/cc.

Fermion Index:

Fermion Index = 0.0005385201
Boson Index = 0.9994614799

Photoelectric:

PE_Redgillite= 25.27 barns/electron
U=PE_Redgillite x rElectron Density= 84.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Redgillite is Not Radioactive

Redgillite Classification

Dana Class:

31.02.08.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.02)where (A+ B++)6 (XO4) Zqï¿½x(H2O)

(31.02.08)Dana Group

31.02.08.01 Redgillite! Cu6(OH)10(SO4)•H2O P 2₁/c 2/m

Strunz Class:

07.DD.70 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DD -With only medium-sized cations; sheets of edge-sharing octahedra

07.DD.70 Redgillite! Cu6(OH)10(SO4)•H2O P 2₁/c 2/m

Other Redgillite Information

References:

NAME( AmMin, v91, p1456) PHYS. PROP.(AmMin, v91, p1456) OPTIC PROP.(AmMin, v91, p1456)

See Also:

Links to other databases for Redgillite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Redgillite

Cu6(OH)10(SO4)•H2O
Dana No: 31.02.08.01 Strunz No: 07.DD.70
Locality:

Notes:

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