Grenades (silicates): Grossular
Diagnostic Card.
On the picture. Crystals essonita (variety grossularite), obtained in Passo delta Faya (province of Savona, Liguria, Italy)
Ca 3 Al 2 (SiO 4)3
Crystal system cubic
Hardness of 6.5-7
Specific Gravity 3.59
Cleavage is absent
fracture conchoidal
Colour colorless, differently colored
Color white powder
Gloss glass
Grossular, got its name from the late Latin name gooseberry (grossularia), a gemstone is widely known since the 60s. Its color is most often green. Deposits - in Sri Lanka, Canada, Pakistan, South Africa, Tanzania, CIS, USA. Often apparently it is similar to demantoid, at least - on the emerald.
Hessonite - brownish-orange variety grossularite (in the old days it was called Canela). The most famous mine is in Sri Lanka.
Leykogarnet - colorless grossularite. Deposits in Mexico and Canada.
The hydro - dense, opaque, green grossularite hydrated, forms a solid units, trade name Transvaal jade.
Crystals grossularite most easily recognized by their form rhombic dodecahedron or tetragonal-trioctahedron. Less common are purely octahedral and cubic forms, while the most interesting elongated varieties. Grossular is solid and quite heavy minerals, devoid of cleavage, brittle. Net grossularite composition is transparent, but it can also be translucent and opaque, light gray, yellowish, greenish or reddish, with a glass luster.
Grossular called calcium grenades, light green, yellow, copper-brown or brownish color. Colorless, white, pale green, greenish-yellow, apple green, yellowish-green, gray, amber, honey-yellow, wine yellow, brownish-yellow, light brown, pink and red.
Diagnostic features.
Do not melt and is insoluble. In the X-ray finds a weak greenish-yellow fluorescence. Insoluble in acids. Cold water with the powder grossularite is alkaline.
Varieties. Among the many varieties grossularite worth noting Essonne (also known as "pietra cannella" - dog stone for its yellow-brown color); succinite characteristic amber color, Lander (rozolit) of reddish color.
Deposits and application.
It is found in many places in Italy, including in the region of Lombardy - Val Paguera and Monte Coston in Val-Monica; in Trentino - Fassa Valley and in the municipality of Kantsokollit Predasso; in Tuscany - Casa Colina (Province of Grosseto); in Lazio - Agilyaro-Sabas (Province of Rome) and Farnese (Viterbo Province); in Calabria - Donna Angelica (Province of Catanzaro). Grossular also mined in Quebec (Canada) and Ksalostoke (Mexico). In jewelry transparent and colored grossularite difference is used as a gem.
- Gatchell - "New Almadén snag" - arsenide and antimony sulfide (modern sulphosalts)
- Antimony - toxic metal (semi-metal) are widely used in industry, medicine and engineering
- Zirconium - a rare and non- metal and dangerous jewel in the oxide and salts
- Gold - yellow dangerous and toxic metal -date and accurate digital cable technology
- Sulphur - a golden-yellow toxic substance and a sign of volcanic activity
- Cadmium - a toxic uncirculated unknown wide range of people silvery metal
- Lead - a poisonous gray simulator silver metal and toxic metal snag
- Arsenic - poison classic medieval and modern poisoners and medicine in medicine
Toxic and hazardous radioactive rocks and minerals
** - Poisonous stones and minerals (obligatory check in chemical laboratory + clear indication of toxicity)
** - Radioactive rocks and minerals (obligatory check on a regular dosimeter + ban on the open sale of radioactivity in the event of more than 24 mR / hour + additional measures to protect the population)
Catalog minerals and gems in groups of the world
** - Poisonous stones and minerals
** - Radioactive rocks and minerals
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