| 词条 | Brassite |
| 释义 |
| name = Brassite | image = | alt = | caption = | category = Arsenate mineral | formula = Mg(AsO3OH)·4(H2O) | strunz = 8.CE.15 | dana = 39.01.07.01 | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Pbca | unit cell = a = 7.472 Å, b = 10.891 Å, c = 16.585 Å; Z = 8 | color = White | colour = | habit = Cryptocrystalline crusts | twinning = | cleavage = {001} Perfect | fracture = Irregular/uneven, splintery | tenacity = Brittle | mohs = | luster = Silky, dull, earthy | streak = White | diaphaneity = Translucent | gravity = 2.28 | density = | polish = | opticalprop = Biaxial (+) | refractive = nα = 1.531 nβ = 1.546 nγ = 1.562 | birefringence = 0.031 | pleochroism = Non-pleochroic | 2V = 80° | dispersion = r < v moderate | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = +++ HCl, + H2O | impurities = | alteration = | other = | prop1 = | prop1text = | references = [1][2][3][4] }}Brassite is a rare arsenate mineral with the chemical formula Mg(AsO3OH)·4(H2O). It was named brassite, in 1973, to honor French chemist R`ejane Brasse, who first synthesized the compound. The type locality for brassite is Jáchymov of the Czech Republic.[2] It occurs as an alteration of magnesium carbonate minerals by arsenic bearing solutions. It occurs associated with pharmacolite, picropharmacolite, weilite, haidingerite, rauenthalite, native arsenic, realgar and dolomite.[3] LocalitiesCzech Republic:
France:
Germany:
References1. ^Webmineral.com - Brassite {{mineral-stub}}2. ^1 Mindat.org - Brassite 3. ^1 Handbook of Mineralogy - Brassite 4. ^Mineralatlas.com - Brassite 3 : Magnesium minerals|Arsenate minerals|Orthorhombic minerals |
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