Szaibélyite

szaibelyite

ludwigite

fluoborite

inyoite

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Formula: MgBO2(OH)
Anhydrous borate containing hydroxyl, forms a series with sussexite
Specific gravity: 2.62
Hardness: 3 to 3½
Streak: White
Colour: White to light yellow; colourless in transmitted light
Solubility: Slowly soluble in acids
Environments

Chemical sedimentary environments
Metamorphic environments

Szaibélyite is widely distributed; it is found in boron-bearing contact metamorphosed limestone and dolostone, in skarn, on serpentinite, and uncommonly in marine evaporite deposits (Dana, Webmin, HOM).
Associated minerals in skarn include ludwigite, hulsite, magnetite, fluoborite, vonsenite, sinhalite, nordenskiöldine, warwickite, brucite, aragonite, brugnatellite, clinohumite and dolomite (HOM, Mindat).
Associated minerals in marine salt deposits include boracite, sylvite, halite and kainite (HOM, Mindat).

Localities

At the Qaragol Boron mine, 80 kilometers southwest of the city of Zanjan, Iran, the major mineral is hydroboracite, with minor colemanite, inyoite, meyerhofferite and szaibélyite (R&M 92.6.542-544).

At the type locality, the Băiţa mining district, Nucet, Bihor, Romania, szaibélyite occurs in magnesian skarn hosted by dolomitic marble, near the contact with a granitegranodiorite body. Associated minerals include calcite, dolomite, magnesite, kotoite, suanite, ludwigite, fluoborite, fluorite, chondrodite, norbergite, magnetite, brucite, chrysotile, lizardite, clinochlore, lepidocrocite and goethite. Szaibélyite from this locality is estimated to have developed at temperatures of 160 to 450oC and pressures of 0.6 to 3 kbar, at relatively high activity of fluorine, and at low potentials of iron and manganese (CM 39.111-127).

At the Bazhenovsk deposit, Asbest, Sverdlovsk Oblast, Russia, radiating white aggregates of szaibélyite have been found embedded in a serpentinite matrix (FM 80226).

In Zechstein Evaporites at the Boulby Mine, Cleveland, England, UK, szaibélyite has been found intimately associated with volkovskite, boracite, hilgardite and hydroboracite (R&M 91-5.434-441).

At Clarke county, Alabama, USA, szaibélyite occurs in salt cores (Dana).

Alteration

Szaibélyite is an alteration product of colemanite, inyoite, and hydroboracite (Mindat).

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