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accessory mineral |
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accessory mineral [ak′ses·ə·rē ‚min·rəl] (mineralogy) A minor mineral in an igneous rock that does not affect its general character. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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This specific deposit contains 70 per cent calcite, a form of
calcium carbonate; 10 per cent apatite, a rock phosphate (source of
calcium and phosphorous); 15 per cent biotite/vermiculite; and 5 per
cent of accessory minerals such as pyroxene, chlorite, magnetite, and
feldspar. Post-Archean
thermal events recorded in accessory minerals of some xenoliths (zircon,
titanite, rutile) indicate that transient heating of the lower crust,
and possibly magmatic addition, occurred repeatedly, accompanying
intrusion of Proterozoic dyke swarms at 2. Also, mineral separates are more commonly homogeneous than
large crystals, yet they require more care in purification than the
large crystals due to the presence of impurities and accessory minerals. |
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