Sorosilicate (Si2O7 groups)
Specific gravity: 2.9 to 3.0
Hardness: 7 to 7½
Colour: Colourless, yellowish to dark brown, pink
Solubility: Soluble in acids (Dana)
Plutonic igneous environments
Danburite occurs in hypothermal (high temperature) veins, where it is associated with
orthoclase. It occurs in moderate to low temperature and low iron-bearing
contact metamorphic rocks, where it is associated with
wollastonite and sulphides.
Other associated minerals include titanite,
calcite and gypsum
Danburite occurs in granite and metamorphosed carbonates and evaporites, in skarn, in marine salt deposits and in alpine crevices.
At Zechstein, Germany, danburite occurs with anhydrite (Dana).
At the Toroku mine, Takachiho, Nishiusuki District, Miyazaki Prefecture, Japan, danburite is associated with axinite (Dana).
At the Anjanabonoina pegmatites, Ambohimanambola, Betafo, Vakinankaratra, Madagascar, the pegmatite dikes are emplaced in a complex environment of paragneiss, marble and orthogneiss, of medium metamorphic grade. Abundant tourmalinisation extensively affected schist and quartzite units. Veins of quartz, dravite-schorl and danburite are locally present in metasedimentary rocks close to the pegmatites (Mindat).
At Charcas, San Luis Potosi, Mexico,
At Piz Valatscha, Val Medels, Uri, Graubunden, Switzerland, danburite occurs with smoky quartz in gneiss (Dana).
At the type locality, Danbury, Fairfield County, Connecticut, USA, danburite occurs in metamorphosed limestone (Dana).
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