Sphalerite, galena and calcite natural crystals
Weight 890 gr
| CHARACTERISTICS | |
| Weight | 890 gr |
| Size | 135x80x60 mm |
| Reference | 220807679 |
| 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% | |||
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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.
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| Formula PbS] GALENA | |||
| Pb | Lead | Poor metal | 86.6% |
| S | Sulfur | Other no metal | 13.4% |
| 100% | |||
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Galena is a lead sulfide mineral and is the primary lead ore mined worldwide. This mineral is distinguished by its crystallization in the cubic system, often as perfect cubes, although octahedral shapes can also be observed. Galena is recognizable by its bright metallic luster and lead-gray color. Its high density is a notable characteristic that sets it apart from other minerals.
In geological context, galena forms primarily in hydrothermal environments, often in association with other minerals such as sphalerite, pyrite, and calcite. These hydrothermal deposits typically develop in veins or masses, where sulfur- and lead-rich fluids solidify at moderate temperatures.
Galena is of significant economic importance as the primary source of lead, which is used in many industrial applications, from batteries to pigments. Due to its ability to contain traces of silver, galena is also mined for the extraction of this precious metal.
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| Formula CaCO3] CALCITE | |||
| O | Oxygen | Other no metal | 47.96% |
| Ca | Calcium | Alkaline earth metal | 40.04% |
| C | Carbon | Other no metal | 12% |
| 100% | |||
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Calcite is a mineral composed of calcium carbonate. It is one of the most abundant and widespread minerals on Earth. Its formation is mainly of biochemical origin, resulting from the accumulation of shells and skeletons of marine organisms. Calcite occurs in a wide variety of crystalline forms, ranging from transparent and colorless crystals to massive and colored aggregates.
Calcite has a relatively low density and a perfect cleavage in three directions, which facilitates its fragmentation into rhombohedrons. Calcite is easily recognized by its effervescence on contact with a dilute acid, releasing carbon dioxide. Calcite is often birefringent, that is to say it splits the light that passes through it, creating a double image effect.
Calcite is an essential constituent of carbonate sedimentary rocks such as limestones and marls. It is involved in the formation of caves and karsts, by dissolution in acidic waters. Calcite is used in many industries: construction, agriculture, metallurgy and the manufacture of chemicals.
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Shipping time
Your orders are usually shipped the day of the order and at the latest after 2 working days.
Delivery delay
Once the package is supported by the postal service, delivery times are those announced by the Post (letter followed or Colissimo followed). Parcel shipping from France.
Returns and Refund
Our refund and return policy lasts 14 days. You can read the details on the "return and delivery" page.
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