Prase

Where it forms, where it's found

48recorded occurrences

Source · OpenStreetMap

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 2 15.999 31.998
53.26%
14SiSilicon Silicon 1 28.085 28.085
46.74%
Total 60.083 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From Mindat formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
8OOxygen	Oxygen	2	15.999	31.998	53.26%
14SiSilicon	Silicon	1	28.085	28.085	46.74%
	Total	60.083	100.00%

Synonyms

Edinite
Prasem
Prasio
Prasius

Literature, links & citation

Citations

—"Manual of Mineralogy after J. D. Dana", by Klein, Cornelis, and Hurlbut, Jr., Cornelius, 20th Edition, 1985, John Wiley & Sons, publisher, New York, Chichester, Brisbane, Toronot, Singapore: pg. 442.
—"Standard Catalog of Gem Values," 2nd Edition, by Miller, Anna and Sinkankas, John, Geoscience Press, Tucson, Arizona, USA, pg. 85.
1900Gürich, G. (1900): Das Mineralreich. ["Prasem ist z.B. ein Quarz, der durch überaus dicht eingestreute kleine Hornblendenädelchen völlig grün erscheint. Glasglanz und muschliger Bruch lassen ihn von dem lauchgrünen Plasma, dem Chrysopal, dem apfelgrünen Chrysopras, und der Glanz von dem grünen Jaspis unterscheiden; ... Der bekannteste Fundort für Prasem ist Breitenbrunn."]
1912Klockmann, F. (1912): Lehrbuch der Mineralogie. ["Prasem, in XX oder derb, lauchgrün, weil innig mit Strahlstein durchzogen. Breitenbrunn in Sachsen."]
1951Palache, Charles; Berman, Harry; Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons.

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Prase — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/prase-6703},
  note      = {Accessed 2026-05-11}
}