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Prase
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Cape Calamita Mine (Calamita Mine), Capoliveri, Elba Island, Livorno Province, Tuscany, Italy
© Sarah Sudcowsky
A variety of Quartz
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 truely be called a varietal name any longer - since it covers more than one material.
Compare also plasma.
Visit gemdat.org for gemological information about Prase. Currently in public beta-test.
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 truely be called a varietal name any longer - since it covers more than one material.
Compare also plasma.
Visit gemdat.org for gemological information about Prase. Currently in public beta-test.
Classification of Prase | |||||
| mindat.org URL: | http://www.mindat.org/min-6703.html Please feel free to link to this page. | ||||
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Other Names for Prase | |||||
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Other Information | |||||
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. | ||||
References for Prase | |||||
| Reference List: - + | "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. "Dana's System of Mineralogy - Volume III Silica Minerals" 7th edition, by Clifford Frondel, John Wiley and Sons, New York and London. 1962 pg. 219. | ||||
Internet Links for Prase | |||||
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Localities for Prase | |||||
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(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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