Minnesotaite information

Minnesotaite
Minnesotaite
	Minnesotaite
General
Category	Silicate mineral
Formula; (repeating unit)	(Fe2+,Mg)3Si4O10(OH)2
IMA symbol	Mns
Strunz classification	9.EC.05
Crystal system	Triclinic
Crystal class	Pinacoidal (1) ; (same H-M symbol)
Space group	P1
Unit cell	a = 5.623(2) Å, ; b = 9.419(2) Å, ; c = 9.624(3) Å; ; α = 85.21(3)°, β = 95.64(3)°, ; γ = 90.00°; Z = 2
Identification
Color	Greenish gray to olive-green
Crystal habit	Occurs as microscopic needles or platelets, the needles occur in radiating clusters or in sheaves; also fibrous
Twinning	Inferred based on X-ray patterns
Cleavage	Perfect on {001}, micaceous
Fracture	Uneven and irregular
Tenacity	Brittle
Mohs scale hardness	1.5 - 2
Luster	Greasy to waxy, dull
Diaphaneity	Translucent
Specific gravity	3.01
Optical properties	Biaxial (-)
Refractive index	nα = 1.578 - 1.583 nβ = 1.578 - 1.622 nγ = 1.615 - 1.623
Birefringence	δ = 0.037 - 0.040
Pleochroism	X= pale green, Z= colorless to pale greenish yellow
2V angle	Measured: 4°
Dispersion	r < v moderate
References

Minnesotaite is an iron silicate mineral with formula: (Fe²⁺,Mg)₃Si₄O₁₀(OH)₂. It crystallizes in the triclinic crystal system and occurs as fine needles and platelets with other silicates.^[2] It is isostructural with the pyrophyllite-talc mineral group.^[3]

^ 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.
^ ^a ^b Handbook of Mineralogy
^ ^a ^b Minnesotaite on Mindat.org
^ Minnesotaite on Webmineral

[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.

[HBM-2] Handbook of Mineralogy

[Mindat-3] Minnesotaite on Mindat.org

[Webmin-4] Minnesotaite on Webmineral

Minnesotaite information

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