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Kurnakovite

Hydrated borate of magnesium

Field	Value
name	Kurnakovite
image	Kurnakovite-mrz200a.jpg
caption	Kurnakovite from Boron, California
category	Nesoborates
formula	MgB3O3(OH)5·5H2O
IMAsymbol	Kko
strunz	6.CA.20
system	Triclinic
class	Pinacoidal ()
(same H-M symbol)
symmetry	P
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
color	White; colorless in transmitted light
habit	Aggregates of prismatic crystals
twinning	Twinning uncommon
cleavage	Poor to indistinct on {010}
mohs	– 3
luster	Vitreous
streak	White
diaphaneity	Transparent to translucent
gravity	1.847 – 1.852
opticalprop	Biaxial (-)
refractive	nα = 1.488 – 1.491 nβ = 1.508 – 1.510 nγ = 1.515 – 1.525
birefringence	δ = 0.027 – 0.034
2V	Measured: 60° to 80°
references

(same H-M symbol) b = 10.6068(1) c = 6.4447(1) [Å] α = 98.846°, β = 108.981° γ = 105.581°; Z = 2 | length fast/slow =

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.

Discovery and occurrence

Kurnakovite, was first described by Godlevsky in 1940 for an occurrence in the Inder lake borate deposits in Atyrau Province, Kazakhstan, and is named for Russian mineralogist and chemist Nikolai Semenovich Kurnakov (1860–1941).

In addition to the type locality in Kazakhstan, kurakovite has also been reported from the Zhacang-Caka brine lake, Tibet; the Kirka borate deposit, Kiitahya Province, Turkey; the Kramer borate deposit, Boron, Kern County, California; Death Valley National Park, Inyo County, California; and the Tincalayu borax deposit, Salar del Hombre Muerto, Salta Province, Argentina.

Properties

Kurnakovite has triclinic – pinacodial crystallography. It forms as rough, prismatic crystals, typically in dense aggregates. Kurnakovite has distinct cleavage and a conchoidal fracture. Its tenacity is brittle and it ranges between 2.5 – 3 on the Mohs hardness scale. It is not soluble in water, though it will start dissolving in warm acid. Kurnakovite is usually colorless or white and either transparent or translucent. It has a vitreous, pearly luster and a refractive index of between 1.488 – 1.525.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://www.handbookofmineralogy.com/pdfs/kurnakovite.pdf Handbook of Mineralogy]
[http://www.mindat.org/show.php?id=2295&ld=1 Mindat.org]
[http://www.webmineral.com/data/Kurnakovite.shtml Webmineral data]

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

magnesium-minerals nesoborates triclinic-minerals minerals-in-space-group-2

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