Carbonates: Geilussite
Diagnostic card.
Na 2 Ca (CO 3 ) 2 * 5 (H 2 O)
Singonia monoclinic
Hardness 2,5-3
Specific gravity 1.9
Cleavage perfect by prism
Cracked shell
Color white to yellow
Powder in color from white to colorless
Glitter glass
Crystallizes in the monoclinic system. In nature, it is observed in the form of short-prismatic crystals with perfect cleavage in the prism. Their color is white, light gray, light yellow or colorless; Transparent or translucent.
Diagnostic signs.
The mineral is very light and soft; It dissolves in acids in the cold with rapid boiling.
Place of Birth.
Geilussite is found in the deposits Lagunillas and Merida (Venezuela). In association with nortupit, pearsonite and tihit is established in the clay sediments of the lakes Soda Lake and Borax Lake (United States). It is also found in the eastern part of the Gobi Desert (Mongolia). Geylussite is a rare mineral, which has purely scientific and collector interest, a collector's item.
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Poisonous and radioactive dangerous stones and minerals
** - poisonous stones and minerals (mandatory check in the chemical laboratory + explicit indication of toxicity)
** - 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
** - poisonous stones and minerals
** - radioactive stones and minerals
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