Definitions

from The Century Dictionary.

  • A mineral, usually of a pale-green color and vitreous luster, commonly occurring in botryoidal or globular forms with crystalline surface.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Min.) A pale green mineral occurring in crystalline aggregates having a botryoidal or mammillary structure, and rarely in distinct crystals. It is a hydrous silicate of alumina and lime.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy A mineral, a basic calcium, aluminium and iron aluminosilicate, which occurs in stalagtitic aggregates or curved crystals, Ca2Al2Si3O10(OH)2.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Named in 1789 after Hendrik Von Prehn (1733-1785), Dutch colonial governor. This was the first mineral to be named after a person.

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