One of the mysteries of the English language finally explained.
A mineral of the monoclinic crystal system which consists of a hydrated acid phosphate of magnesium, MgH(PO₄).7H₂O, is isomorphous with roesslerite, and occurs as white or yellowish crystals that lose water on exposure to air.
1930s; earliest use found in Mineralogical Abstracts. Blend of phosphorus and rösslerite, after German Phosphorrösslerit.
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