Pararaisaite
Pararaisaite is a rare hydrated copper magnesium hexavalent tellurite mineral with the chemical formula CuMg[Te6+O4(OH)2]·6H2O. It belongs to the monoclinic crystal system and is classified as a tellurate. The mineral exhibits a vitreous to pearly luster and is typically greenish in color. It has a relatively low hardness on the Mohs scale and a moderate density. Pararaisaite is notable for its complex chemical composition, which includes hexavalent tellurium, a rare element in mineral structures. It is part of the broader group of secondary minerals that form in oxidized ore deposits.
Overview
Pararaisaite is a rare hydrated copper magnesium hexavalent tellurite mineral with the chemical formula CuMg[Te6+O4(OH)2]·6H2O. It belongs to the monoclinic crystal system and is classified as a tellurate. The mineral exhibits a vitreous to pearly luster and is typically greenish in color. It has a relatively low hardness on the Mohs scale and a moderate density. Pararaisaite is notable for its complex chemical composition, which includes hexavalent tellurium, a rare element in mineral structures. It is part of the broader group of secondary minerals that form in oxidized ore deposits.
Etymology
The name 'pararaisaite' is derived from the prefix 'para-', indicating a relationship to another mineral, and 'raisaite', which is likely a reference to a person or place. The IMA approved the name, but no specific discovery year or detailed origin of the name is provided.
How to recognize it
Pararaisite can be identified by its greenish color and vitreous to pearly luster. Its hardness is relatively low, though the exact Mohs value is not specified. The mineral has a moderate density and may exhibit a white or pale streak. Due to its rarity and specific chemical composition, it is easily confused with other hydrated copper minerals, but its unique tellurate chemistry and monoclinic crystal system help distinguish it.
Trivia
Pararaisaite contains hexavalent tellurium, which is uncommon in mineral structures. Its chemical formula includes six water molecules, making it a highly hydrated mineral. The mineral's name includes the prefix 'para-', suggesting a close but distinct relationship to another mineral species.