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Diopside

Specimen of Diopside Diopside is one of the more attractive pyroxenes, often forming cutable gems, particularly as vividly green Chromian Diopside, and Diopside may either be chatoyant or show asterism when cut. The name 'pyroxene' is derived from the Greek 'pyr' meaning fire and 'xenos' a stranger or alien, as it was believed not to be a primary mineral of volcanic rocks, that are 'formed in fire'. Today we know this is wrong, and pyroxenes are known to be abundant in lava and many other rocks. Pyroxenes are chemically very diverse and many species have been described.
It was named by José Bonifacio d'Andrada e Silva (1763-1838) in 1800 for the Greek 'dis' meaning two and 'opsis' meaning view, because two views can be taken of the prismatic crystals, when describing them crystallographically. Diopside is a frequent component of metamorphic rocks, and very appealing crystals can be found in metamorphic limestone, that either produces an appealing white background or allows individual crystals to be etched out. Diopside is freely miscible with Hedenbergite, and a number of varieties of Diopside and intermediate members of the series have been described. These include Diallage, that has distinct parting, Violan (distinctly purple from Italy), and Salite, named for the locality Sala in Sweden, with 10-50% Hedenbergite, and 90-50% Diopside.
Our records indicate that Diopside from a range of deposits occurs on specimens that also carry one or more of the following minerals [some of these may actually be Hedenbergite or near 50/50 Diopside/Hedenbergite]: Albite, Andradite, Anthophyllite, Arfvedsonite, Beryl, Calcite, Chondrodite, Chromite, Clinochlore var. Rhipidolite, Eudialyte, Fluorite, Franklinite, Galena, Gearksutite, Grossular, Hydrodelhayelite, Jarlite, Kolbeckite, Lazurite, Magnesio-aluminokatophorite, Magnetite, Mahlmoodite, Marialite, Meionite, Minehillite, Muscovite, Nepheline, Pargasite, Perovskite, Phlogopite, Pyrite, Pyrrhotite, Quartz, Rhodonite, Richterite, Scapolite, Spessartine, Sphalerite, Spinel var. Pleonast, Titanite, Tremolite, Uvarovite, Vesuvianite, Willemite, and Wollastonite.

Specimen Handling

Diopside is for all practical purposes stable in a normal household environment. It is not harmed by light, changes in temperature in the normal comfort range, or known to decompose. Diopside specimens can be brittle and should be handled with care like any other mineral specimen. Diopside is not appreciably soluble in water.

Bibliography

Anthony, John Williams, Richard A. Bideaux, Kenneth W. Bladh & Monte C. Nichols. 1995. Handbook of mineralogy, vol. 2.1
Blackburn, William H. & William H. Dennen. 1997. Encyclopedia of mineral names. Canadian Mineralogist, special publication 1.
Deer, W.A., R.A. Howie & J. Zussman. 1963. Rock forming Minerals.
Gaines, Richard W., H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, Abraham Rosenzweig & Vandall T. King. 1997. Dana's new mineralogy: the system of mineralogy of James Dwight Dana and Edward Salisbury Dana, 8th ed.
Hintze, Carl (ed.) 1889-1897. Handbuch der Mineralogie, vol. 2.
Morimoto, Nobuo. 1989. Nomenclature of Pyroxenes. Canadian Mineralogist, 27, 143-156
Morimoto, N., J. Fabries, A.K. Ferguson, I.V. Ginzburg, M. Ross, F.A. Seifert, J. Zussman, K. Aoki & G. Gottardi. 1988. Nomenclature of pyroxenes. American Mineralogist, 73(9-10), 1123-1133
Noe-Nygaard, Arne. 1966. Mineralogi, 3rd ed.
Ramdohr, Paul & Hugo Strunz. 1980. Klockmann's Lehrbuch der Mineralogie, 16th ed.
Roberts, Willard Lincoln, Thomas J. Campbell & George Robert Rapp jr. 1990. Encyclopedia of Minerals 2nd ed.
Sinkankas, John. 1964. Mineralogy.

This page is authored by Claus Hedegaard.

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