Kurnakovite information

Kurnakovite
Kurnakovite
	Kurnakovite from Boron, California
General
Category	Nesoborates
Formula; (repeating unit)	MgB3O3(OH)5·5H2O
IMA symbol	Kko
Strunz classification	6.CA.20
Crystal system	Triclinic
Crystal class	Pinacoidal (1) ; (same H-M symbol)
Space group	P1
Unit cell	a = 8.3479(1) ; b = 10.6068(1) ; c = 6.4447(1) [Å] ; α = 98.846°, β = 108.981° ; γ = 105.581°; Z = 2
Identification
Color	White; colorless in transmitted light
Crystal habit	Aggregates of prismatic crystals
Twinning	Twinning uncommon
Cleavage	Poor to indistinct on {010}
Mohs scale hardness	2+1⁄2 – 3
Luster	Vitreous
Streak	White
Diaphaneity	Transparent to translucent
Specific gravity	1.847 – 1.852
Optical properties	Biaxial (-)
Refractive index	nα = 1.488 – 1.491 nβ = 1.508 – 1.510 nγ = 1.515 – 1.525
Birefringence	δ = 0.027 – 0.034
2V angle	Measured: 60° to 80°
References

Kurnakovite is a hydrated borate of magnesium with the chemical composition MgB₃O₃(OH)₅·5H₂O. It is a member of the inderite group and is a triclinic dimorph of the monoclinic inderite.^[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.
^ Handbook of Mineralogy
^ ^a ^b Mindat.org
^ Webmineral data

[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] Mindat.org

[Webmin-4] Webmineral data

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