299^€

Sphalerite, galena and calcite in crystals

Weight 1.55 kg

CHARACTERISTICS
Weight	1550 gr. 1.55 kg
Size	max 19 cm 190x100x70 mm
Reference	220807680
Mineral	mineral Sphalerite
Mineral 2	mineral species Galena
Mineral 3	mineral Calcite
Category	Rocks and minerals
Group	Crystallization
Country	Bulgaria

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Formula ZnS] SPHALERITE
Zn	Zinc	Poor metal	64.06%
S	Sulfur	Other no metal	33.06%
Fe	Iron	Transition metal	2.88%
			100%
Sphalerite is a mineral that belongs to the class of sulphides, more precisely, it is a zinc sulphide, with the chemical formula ZnS. It is mainly recognized as the most important source of zinc. Sphalerite typically occurs as cubic, octahedral, or dodecahedral crystals, but can also take the form of granular or compact masses. Its color varies from brown to black, although it can also be yellow, green or colorless. Its hardness on the Mohs scale is 3.5 to 4, which makes it relatively soft. Sphalerite is also notable for its high optical dispersion, greater than that of diamond, which gives rise to remarkable brilliance when cut into a gem.
Formula PbS] GALENA
Pb	Lead	Poor metal	86.6%
S	Sulfur	Other no metal	13.4%
			100%
Galena is a mineral of the sulfide class, with a chemical formula PbS. It is known for its high density, metallic luster and gray color and usually forms cubic or octahedral crystals, but can also occur in massive or grained form. Galena is an important source of silver, giving it great economic value. It is commonly found in hydrothermal veins and sedimentary deposits. Due to its Pb content, handling of galena must be done with care to avoid any toxic exposure.
Formula CaCO₃] CALCITE
O	Oxygen	Other no metal	47.96%
Ca	Calcium	Alkaline earth metal	40.04%
C	Carbon	Other no metal	12%
			100%
Calcite is a mineral commonly found in the earth's crust, belonging to the carbonate category. Its chemical formula indicates that it is composed of calcium carbonate. It comes in various shapes and colors, although the most common is white or colorless. Calcite is known for its birefringent nature, that is to say it splits the light rays that pass through it, giving the impression of seeing a double image when looking at it. It has a hardness of 3 on the Mohs scale, which means it is relatively soft. Calcite is also soluble in hydrochloric acid. It is widely used in industry because of its ease of extraction and processing, for example in the manufacture of cement, as a soil acidity corrector or even as an ornamental stone.

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