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Labradorite - LoveToKnow 1911 (220 words) |
 | LABRADORITE, or Labrador Spar, a lime-soda felspar of the plagioclase group, often cut and polished as an ornamental stone. |
| Common labradorite, without play of colour, is an important constituent of such rocks as gabbro, diorite, andesite, dolerite and basalt. |
| The term labradorite is unfortunately used also as a rockname, having been applied by Fouque and Levy to a group of basic rocks rich in augite and poor in olivine. |
| LABRADORITE (Calcium Sodium Aluminum Silicate) (507 words) |
| Labradorite is a member of the plagioclase series of minerals. |
| Labradorite is defined at approximately the 50% to 70% CaAl |
| Labradorite by definition must contain 50-70% calcium to 50-30% sodium in the sodium/calcium position of the crystal structure. |
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