4.5 x 3.0 x 1.1 cm. Hydromagnesite is an unusual and uncommon hydrated carbonate found as a low-temperature hydrothermal mineral occurring in veinlets in serpentine and altered magnesium-rich igneous rocks. This fine plate consists of snow-white to colorless, feathery and hair-like crystals aggregates and hails from an uncommon California locality - Red Mountain in Santa Clara County. Ex. Ed Ruggiero Collection.
7.3 x 5.5 x 3.1 cm. Radial sprays of glassy hydromagnesite needles are nicely scattered on pastel-green magnesite (coloured by nickel impurities) with an unusual knobby/bubbly/drusy form. The specimen is from the Cedar Hill Quarry of Pennsylvania [see, however, http://www.mindat.org/mesg-7-150141.html], a gravel quarry mining the State-line belt of serpentines and is near the Woods Chrome Mine. Ex. Lloyd Tate Collection.
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