Sulphates: Alunogen
Diagnostic card.
Al 2 (SO 4 ) 3 * 18 (H 2 O)
Triclinic syngene
Hardness 1.5-2
Specific weight 1.77
Cleavage is perfect
Color is colorless or white
Color in powder white
Glitter glass
This sulfate is represented by fibrous masses, efflorescences, crusts and very rarely prismatic crystals, colorless or whitish.
Diagnostic signs.
Sour to the taste.
Origin.
It is formed as a product of near-surface oxidation of pyrite deposits; In particular, it is characteristic of desert regions. There it is found together with alotrichin, pikkerengitis, epsomite, alum, gypsum, melanterite. It is also deposited among the products of fumarole activity together with sulfur.
Place of Birth.
The most famous and the most significant deposit is Saint-Bel in France. Among others: Antofagasta in Chile, location in Bohemia (Czech Republic), in the states of New Mexico, North Carolina, Colorado, Utah (USA). In Italy it is famous in Pozzuoli and Miseno.
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Poisonous and radioactive dangerous stones and minerals
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** - radioactive stones and minerals (mandatory check on the standard dosimeter + ban on open sales in case of radioactivity exceeding 24 milli / g / h + additional measures of population protection)
Catalog of minerals and semi-precious stones of the world by groups
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