MINERALS INDEX
Chondrodite |
| Mg(OH,F)2.2MgSiO4 |
| Monoclinic |
Physical character
Chondrodite is not known in crystals but forms the cores of norbergite grains (261). It is
more nearly colorless and has a higher index of refraction than the norbergite, has little
pleochroism, and shows polysynthetic twinning, which ends abruptly at the norbergite. The
optical constants of the chondrodite cores are given by Larsen (262) as follows: Negative,
2V large; a = 1.594, b = 1.607, and g = 1.619.
Occurrence
At Franklin chondrodite is known only as described above, but dark orange-red
"chondrodite" in rude crystals with spinel and garnet was found in a prospect
shaft on the Tuttle farm, about half a mile southeast of the Parker shaft. Specimens were
seen in the Kemble collection.
Yellow grains in limestone from Rudeville were proved optically to be chondrodite.
Neither chondrodite nor norbergite has been specifically reported at Sterling Hill, but there can be little doubt that one or both were formed in the limestone there, where contact-metamorphic conditions were similar to those in the limestone at Franklin.
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© by Herb Yeates 1997-2006.
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page created: August 12, 2006 5:54 PM
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