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Prase
A variety of Quartz
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About Prase
Formula:
SiO2
Name:
From the Greek praso = leek.
Originally, the varietal name "prase" was applied to a dull leek-green colored quartzite (a rock, not a mineral*); but over the years it has been also applied to other materials, particularly a green colored jasper of similar color. For perhaps more than a century it was restricted to granular micro-crystalline varieties of quartz and the original quartzite; but in recent years euhedral crystals of quartz having a similar leek-green color have had the term applied to them as well, expanding the definition beyond micro-crystalline forms. Now it is simply a color descriptor for quartz: If it is leek-green, it is called "prase" - whether it is micro- or macro-crystalline, and no matter what causes the color. Basically, the term no longer has any scientific rigor - it has become a general term; it can't even truly be called a varietal name any longer - since it covers more than one material.
* However, the original German definition of "Prasem" is that of a quartz, in crystals or massive, which is coloured leek-green by acicular inclusions of "Strahlstein" (= actinolite ) (Gürich, 1900; Klockmann, 1912).
Compare also plasma and prasiolite.
Visit gemdat.org for gemological information about Prase.
* However, the original German definition of "Prasem" is that of a quartz, in crystals or massive, which is coloured leek-green by acicular inclusions of "Strahlstein" (= actinolite ) (Gürich, 1900; Klockmann, 1912).
Compare also plasma and prasiolite.
Visit gemdat.org for gemological information about Prase.Unique Identifiers
Mindat ID:
6703 (as Prase)
3337 (as Quartz)
3337 (as Quartz)
Long-form identifier:
mindat:1:1:6703:0 (as Prase)
mindat:1:1:3337:0 (as Quartz)
mindat:1:1:3337:0 (as Quartz)
Similar Names
| Phase 412 | A synonym of Pfaffenbergite |
| Phase 430 | A synonym of Bonaccorsiite |
Pronunciation of Prase
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Chemistry of Prase
Mindat Formula:
SiO2
Elements listed:
Synonyms of Prase
Varieties of Prase
| Prase-malachite | A term for Prase enclosing Malachite. |
Common Associates
Associations Based on Photo Data:
| 71 photos of Prase associated with Hematite | Fe2O3 |
| 35 photos of Prase associated with Hedenbergite | CaFe2+Si2O6 |
| 27 photos of Prase associated with Quartz | SiO2 |
| 27 photos of Prase associated with 'Amethyst' | SiO2 |
| 23 photos of Prase associated with Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| 22 photos of Prase associated with Andradite | Ca3Fe3+2(SiO4)3 |
| 17 photos of Prase associated with Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| 15 photos of Prase associated with Calcite | CaCO3 |
| 13 photos of Prase associated with 'Byssolite' | AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| 12 photos of Prase associated with Siderite | FeCO3 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Prase
mindat.org URL:
https://www.mindat.org/min-6703.html
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References for Prase
Reference List:
Nassau, Kurt, Prescott, Betty E. (1977) A unique green quartz. American Mineralogist, 62 (5-6) 589-590
Paradise, Thomas R. (1982) The Natural Formation and Occurrence of Green Quartz. Gems & Gemology, 18 (1) 39-42 doi:10.5741/gems.18.1.39
Klemme, Stephan, Berndt, Jasper, Mavrogonatos, Constantinos, Flemetakis, Stamatis, Baziotis, Ioannis, Voudouris, Panagiotis, Xydous, Stamatios (2018) On the color and genesis of prase (green quartz) and amethyst from the Island of Serifos, Cyclades, Greece. Minerals, 8 (11) 487 doi:10.3390/min8110487
Localities for Prase
Showing 75 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| |
| Keith F Compton collection | |
| |
| Grguric et al. (2006) |
Austria | |
| Exel (1993) |
| R. Hasler Collection | |
| NHM Vienna collection (collected in 2022) |
| Exel (1993) |
| Exel (1993) |
| Exel (1993) |
| Exel (1993) |
Bulgaria | |
| Marcus Voigt Collection |
China | |
| Baiwu Hao (2010) |
| Yu Chen et al. (1984) +1 other reference | |
| Ottens et al. (2012) |
Ecuador | |
| Alejandro Felix Gutierrez |
France | |
| BRGM (1980) |
| Lacroix (1907) |
| Companyo (1861) |
| Baret (1905) |
| Baret (1905) |
| Baret (1905) |
Germany | |
| Müller (1984) |
| Wittern (2001) |
| Wittern (2001) |
| Weiß (1990) |
| Wittern (2001) |
| Wittern (2001) |
| J. Müller |
Greece | |
| Christos Spiromitros Collection |
| Soulamidis et al. (2024) | |
| Hyrsl +3 other references |
| Fritz Schreiber collection and field ... +2 other references | |
| Piet van Kalmthout collection | |
| Christos Spiromitros specimens | |
| L.Rantos collection | |
| Klemme et al. (2018) | |
Ireland | |
| Henwood (1871) |
Italy | |
| Campostrini (2001) |
| Exel (1980) +1 other reference |
| De Michele (1974) |
| no ref. in literature |
| Garavelli C.L. & Vurro F. (1984) |
Megalo Chorio, Serifos Island, Milos, South Aegean, Greece