Difference between revisions of "Diopside"
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== Description == | == Description == | ||
| − | A green, calcium magnesium silicate mineral sometimes used as a [[gemstone]]. Diopside is a [[pyroxene]] type mineral with short, monoclinic crystals. The transparent to translucent crystals have either a square or octagonal cross section. The color of diopside crystals | + | A green, calcium magnesium silicate mineral sometimes used as a [[gemstone]]. Diopside is a [[pyroxene]] type mineral with short, monoclinic crystals. The transparent to translucent crystals have either a square or octagonal cross section. The color of diopside crystals usually from light to dark green, but may be blue, brown, colorless or pale violet. Diopside has been found at many locations throughout Europe (Russia, Finland, Sweden, Switzerland and Italy), Canada (Ontario, Quebec) and the United States (New York, California and Maine). Powdered diopside is used as a matting agent in ceramic glazes. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
calcium magnesium silicate; diopside (Fr.); diópsido (Esp., Port.); Diposid (Deut.); diopsiet (Ned.) | calcium magnesium silicate; diopside (Fr.); diópsido (Esp., Port.); Diposid (Deut.); diopsiet (Ned.) | ||
| − | + | [[[SliderGallery rightalign|DIOPSIDE PMA.TIF~FTIR (PMA)|Diopsideitaly1.jpg~Raman (U of Parma)]]] | |
| − | [[[SliderGallery rightalign|DIOPSIDE PMA.TIF~FTIR (PMA)|Diopsideitaly1.jpg~Raman]]] | ||
| − | |||
==Physical and Chemical Properties== | ==Physical and Chemical Properties== | ||
| − | * Monoclinic system with slender square or octagonal prisms that are often twinned | + | * Monoclinic system with slender square or octagonal prisms that are often twinned |
| − | * Cleavage occurs at intersecting angles of 87 and 93 degrees | + | * Cleavage occurs at intersecting angles of 87 and 93 degrees |
| − | * Luster = vitreous to dull | + | * Fracture = uneven to conchoidal |
| + | * Luster = vitreous to dull | ||
* Streak = white, gray or green | * Streak = white, gray or green | ||
| + | * Fluorescence = green in LW; inert in SW | ||
| + | * Pleochroism = weak to strong; light and dark green | ||
| + | * Dispersion = weak to distinct | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 23: | Line 25: | ||
|- | |- | ||
! scope="row"| Mohs Hardness | ! scope="row"| Mohs Hardness | ||
| − | | 5. | + | | 5.5 - 6.5 |
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| Line 29: | Line 31: | ||
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| − | | 1.66-1. | + | | 1.66-1.73 |
| + | |- | ||
| + | ! scope="row"| Birefringence | ||
| + | | 0.024 - 0.030 | ||
|} | |} | ||
| Line 35: | Line 40: | ||
* Mineralogy Database: [http://www.webmineral.com/data/Diopside.shtml Diopside] | * Mineralogy Database: [http://www.webmineral.com/data/Diopside.shtml Diopside] | ||
| − | + | * Gem Identification Lab Manual, Gemological Institute of America, 2016. | |
* Robert Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Company, Radnor, PA, 1992 | * Robert Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Company, Radnor, PA, 1992 | ||
| − | |||
* ''Encyclopedia Britannica'', http://www.britannica.com Comment: "diopside" [Accessed December 4, 2001]. (tech info) | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "diopside" [Accessed December 4, 2001]. (tech info) | ||
| − | |||
* C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 | * C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 | ||
| − | + | * Wikipedia: [https://en.wikipedia.org/wiki/Diopside Diopside] (Accessed Sept. 7, 2005 and Dec 2022) | |
| − | * Wikipedia: | ||
| − | |||
* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976 | * ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976 | ||
| − | |||
* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | * ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | ||
Revision as of 14:20, 20 December 2022
Description
A green, calcium magnesium silicate mineral sometimes used as a Gemstone. Diopside is a Pyroxene type mineral with short, monoclinic crystals. The transparent to translucent crystals have either a square or octagonal cross section. The color of diopside crystals usually from light to dark green, but may be blue, brown, colorless or pale violet. Diopside has been found at many locations throughout Europe (Russia, Finland, Sweden, Switzerland and Italy), Canada (Ontario, Quebec) and the United States (New York, California and Maine). Powdered diopside is used as a matting agent in ceramic glazes.
Synonyms and Related Terms
calcium magnesium silicate; diopside (Fr.); diópsido (Esp., Port.); Diposid (Deut.); diopsiet (Ned.)
Physical and Chemical Properties
- Monoclinic system with slender square or octagonal prisms that are often twinned
- Cleavage occurs at intersecting angles of 87 and 93 degrees
- Fracture = uneven to conchoidal
- Luster = vitreous to dull
- Streak = white, gray or green
- Fluorescence = green in LW; inert in SW
- Pleochroism = weak to strong; light and dark green
- Dispersion = weak to distinct
| Composition | CaMgSi2O6 |
|---|---|
| Mohs Hardness | 5.5 - 6.5 |
| Density | 3.2-3.6 g/ml |
| Refractive Index | 1.66-1.73 |
| Birefringence | 0.024 - 0.030 |
Resources and Citations
- Mineralogy Database: Diopside
- Gem Identification Lab Manual, Gemological Institute of America, 2016.
- Robert Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Company, Radnor, PA, 1992
- Encyclopedia Britannica, http://www.britannica.com Comment: "diopside" [Accessed December 4, 2001]. (tech info)
- C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
- Wikipedia: Diopside (Accessed Sept. 7, 2005 and Dec 2022)
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998