Sassolite


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sassolite

[′sas·ə‚līt]
(mineralogy)
H3BO3 A white or gray mineral consisting of native boric acid usually occurring in small pearly scales as an incrustation or as tabular triclinic crystals. Also known as sassoline.

Sassolite

 

(also sassoline), a borate mineral with the chemical formula H3BO3 or B(OH)3. Sassolite crystallizes in the triclinic system, forming fine, colorless scales with a pseudohexagonal habit or white efflorescences. The color is white, gray, or greenish, with a pearly luster. Sassolite has a hardness of 1 on Mohs’ scale, and its density is 1,480 kg/m3. A rare mineral, sassolite is formed by volcanic processes as a fumarolic sublimate deposited in the form of films along thin cracks of volcanogenic rocks.

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[12] reported that the main component found in 11 samples was galena (PbS) while, for the remaining 12 samples, the main component was found to be one of the following: amorphous carbon, zincite (ZnO), sassolite ([H.sub.3]B[O.sub.3]), or calcite/aragonite (CaC[O.sub.3]).
Boron sources of [H.sub.3]B[O.sub.3] were determined as "sassolite" (reference code: 01-073-2158) and [B.sub.2][O.sub.3] was determined as the mixture of two types of "boron oxide" (reference codes: 00-006-0297 and 01-088-2485).
According to the XRD results, ZnO, MgO, [H.sub.3]B[O.sub.3], and zinc borate (commercial) were characterised as "01-079-2205" coded zinc oxide, "01-077-2179" coded periclase, "01-0732158" coded sassolite, and "00-035-0433" coded zinc oxide borate hydrate, respectively.