Zeolites: Thomsonite
Diagnostic card.
Na Ca 2 Al 4 (Al, Si) 2 (Si 2 O 10 ) 2 * 6 H 2 O
Diamond orthogonality
Hardness 5-5,5
Specific weight 2.2-2.4
Cleavage is perfect
Broken fracture
Color white, yellow, green
Color in powder white
Glitter from glass to pearly
It is represented by prismatic crystals of needle and columnar, as well as plate form, and often fibrous aggregates. Coloring light gray, reddish-yellow or green. Thomsonite has a glass shine, with a tendency to pearly.
The shape of the crystals. Snap-like growths. Class of symmetry. Prismatic - 2 / m. Cleavage. Perfect by (010). Aggregates. Sixth, radiant, leafy, sheath-like, spherulitic.
Diagnostic signs.
Easily melts in the flame of a candle. Hydrochloric acid decomposes it to form jelly-like silica. Fused in white enamel. Behavior in acids. It decomposes in HCl.
Origin.
Together with other zeolites it is usually found in the cavities of basalt rocks.
Place of Birth.
Thomsonite is found in the basalts of Scotland, on the island of Fair Yor (Iceland), in Northern Ireland, in Oregon (USA) and on the island of Disco in Greenland. In Italy it is represented in the voids of leukoterrites on Mount Somme, in the basins of the Cyclops Islands (Sicily), in the copper deposit of Kazarca in the Liguria region and in many other places.
Application.
Zeolites, and Thomsonite in particular, bind and remove from the body harmful substances that come with food, and supply it with trace elements necessary for normal physiological activity. In the jewelry business Thomsonites sometimes grind, giving them the shape of cabochons. It is considered a jeweler stone of the lower, third order.
Thomsonite, gypsum. Voevoli Khan River, Wed. Siberia (C), Russia. Zeolite (Thomsonite?). Polished pebbles with a diameter of ~ 5 cm. Anadjakan r. (Tributary of the Severnaya River), ~ 300 km to YuYV from Norilsk, Wed. Siberia (C), Russia. Photo: © А.А. Evseev.
Thomsonite. Faroe Islands, the Atlantic Ocean; Denmark. Thomsonite. Kladno (rn), Czech Republic. Photo: © А.А. Evseev.
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Poisonous and radioactive dangerous stones and minerals
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Catalog of minerals and semi-precious stones of the world by groups
** - poisonous stones and minerals
** - radioactive stones and minerals
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