The recently discovered, transparent Magnesite rhombohedrons appear identical to Calcite , but can be distinguished by the slight hardness difference, and more efficiently by the fact that Calcite effervesces even in cold and diluted hydrochloric acid, whereas Magnesite only in hot, undiluted hydrochloric acid. Dolomite - Cannot be distinguished from Magnesite by ordinary methods. However, Dolomite usually forms as curved crystals, whereas Magnesite does not. Commonly Occurs With Calcite , Dolomite , Aragonite , Serpentine , Strontianite , Quartz , Brucite, Artinite Noteworthy Localities Excellent specimens came from Oberndorf, Styria, Austria, and in St. Gotthard, Zillertal, Austria. Clear crystals identical in appearance to the Iceland Spar variety of Calcite occur in Brumado, Bahia, Brazil.
Many localities exist on the west coast of the U.S., chiefly in the Coast Ranges of California.
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