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Helvite

Named for the Latin word helvus, which means “amber,” in reference to the mineral’s color, which is typically a golden-yellow. Helvite is an uncommon mineral that occurs in skarn, contact zones, gneiss, granite pegmatites, and granites. Localities for Helvite include in Germany, Sweden, Russia, Kyrgyzstan, Norway, Finland, the United States, Japan, and other localities. Helvite is pyroelectric and will generate a charge in response to heat application.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/helvine.pdf

Hematite

Named for the Greek word aimatodes, meaning “bloodlike,” in reference to the mineral’s color and streak. Hematite is extremely common with thousands of localities with exceptional crystals from Switzerland, Romania, Italy, England, Norway, Brazil, South Africa, Algeria, and the United States. Hematite occurs as an accessory mineral in igneous rocks, as a sublimate in volcanic rocks, in high-temperature hydrothermal veins, a contact metamorphism product, in metamorphosed banded iron formations, as a cement in sedimentary and a constituent in oolitic iron formations, and it is abundant on weathered iron-bearing minerals.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/hematite.pdf

Hemihedrite

Named in reference to the mineral’s hemihedral morphology as exhibiting only half the faces required for complete crystallographic symmetry. Hemihedrite is a rare mineral that can be found only in localities in the United States in Arizona and Nevada, and an additional locality in the Esfahan Province of Iran. Hemihedrite forms from the oxidation of galena, sphalerite, and pyrite in hydrothermal lead-bearing veins.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/hemihedrite.pdf

Hemimorphite

Named in reference to the mineral’s hemimorphic morphology as having different crystalline forms at the end of each of its crystallographic axes. Hemimorphite is relatively common and forms as a secondary mineral in oxidized zinc-rich mineral deposits. Localities for good material are in Romania, Slovakia, England, Belgium, Germany, Russia, Iran, the United States, and Mexico, and there are many other additional localities. Hemimorphite is strongly pyroelectric, generates a charge in response to heat, and can also fluoresce a blue color under short-wave ultraviolet light.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/hemimorphite.pdf

Hendricksite

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahderal. Zinc occupies the (M) octahedral sites between the layers of (T) sites of Si and Al. K is the interlayer, making this an ordinary (True) mica. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Hendricksite is the only zinc bearing mica. Occurs as plate-shaped or short prismatic crystals with rough terminations up to 40cm with a copper deep red to blackish red color. (Bernard & Hrysl). As pointed out by Reider et al (Can Min.), Hendricksite could be included in a solid solution series with "zincohendricksite" and "manganoanhendricksite" at the ends.

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahderal. Zinc occupies the (M) octahedral sites between the layers of (T) sites of Si and Al. K is the interlayer, making this an ordinary (True) mica. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Occurs as plate-shaped or short prismatic crystals with rough terminations up to 40cm with a copper deep red to blackish red color. (Bernard & Hrysl). As pointed out by Reider et al (Can Min.), Hendricksite could be included in a solid solution series with "zincohendricksite" and "manganoanhendricksite" at the ends.

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