Roscoelite information

Roscoelite
Roscoelite
	Roscoelite and gold
General
Category	Phyllosilicate
Formula; (repeating unit)	K(V3+,Al,Mg)2AlSi3O10(OH)2
IMA symbol	Rcl
Strunz classification	9.EC.15
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) ; (same H-M symbol)
Space group	C2/m
Identification
Formula mass	426.53 g/mol
Colour	olive-green to green-brown
Crystal habit	scales, fans, druses, rosettes, fibrous or felted aggregate.
Cleavage	Perfect plane {0,0,1}
Fracture	platy
Mohs scale hardness	1
Lustre	pearly
Diaphaneity	semi-transparent to translucent
Specific gravity	2.92 - 2.96
Optical properties	Biaxial (-)
Refractive index	nα=1.60 nβ=1.66 nγ=1.67
Birefringence	δ =
Pleochroism	olive green to green-brown
Fusibility	loses water

Roscoelite is a green mineral from the mica group that contains vanadium.

The chemical formula is K(V³⁺, Al, Mg)₂AlSi₃O₁₀(OH)₂.^[2] Crystals of roscoelite take on the monoclinic form, and are from the 2/m point group. The appearance is semi transparent to translucent coloured olive brown to green brown. The lustre is pearly. The mineral shows pleochroism with X showing green-brown, and Y and Z axes showing olive-green colour. The mineral was named after Henry Enfield Roscoe who first produced vanadium metal.

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ Roscoelite information^{[full citation needed]}

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[2] Roscoelite information^{[full citation needed]}

Roscoelite information

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