Ascharite

ASCHARITE (named after the place of the finding near the Aschersleben city, within the East Germany), szaibelyite (EN: ascharite, szaibelyite; DE: Ascharit; FR: ascharite, ES: ascharita; RU: ашарит), is the mineral of the class of borates, Mg2(OH)[V2O4(OH)]. The impurities are: Fe2+, Mn.

Hydroascharite is the variety of ascharite with the increased content of the weakly bound water. There are known two monoclinic and one rhombic modifications of ascharite. At the basis of the sub-chained structure of ascharite are the columns of the Mg(O,OH)6 octahedra, which are connected together by the isolated anionic radicals of the double triangles BO3 and BO2OH. Crystals are rare, more often are common the fine-fibrous aggregates or pseudomorphs on the early endogenous borates, dense and earthy masses, concretions. Incrustations are characteristic for its exogenous varieties. The colour is white, grayish, yellowish. It is brittle. The hardness is 3-3.5. The density is 2690 kilograms per cubic metre.

Ascharite is the common mineral of the endogenous deposits of the boron ores and of the salt-bearing sedimentary strata. It is the main mineral of the endogenous boron ores of the suanite, kotoite, ludwigite, and other types. Within the Canada, North Korea, and Morocco, its concentrations are significant within serpentinites. Within the USSR, large clusters of ascharite are known within the halogenous strata.