Glauberite Mineral Specimen (California, USA) Size:Option E (25.3 g) 5 g) Silver Sheen Obsidian

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Glauberite Mineral Specimen (California, USA) Size:Option E (25.3 g) 5 g) Silver Sheen ObsidianGlauberite Mineral Specimen Glauberite [sodium calcium sulfate, Na2Ca(SO4)2] crystallizes in the monoclinic system as tabular or prismatic, steeply inclined, wedge shaped, dipyramidal crystals. Glauberite crystals are very soft (Mohs hardness of 2. 5 3. 0) and unstable and as they dissolve or crumble, they may be altered or replaced by more stable minerals such as gypsum or calcite, thus forming pseudomorphs. Glauberite is popular among collectors for