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QUARTZ - A very hard, glassy-looking mineral; crystallized silicon dioxide; constituent of all acidic igneous rocks and some intermediate and basic rocks; common in metamorphic rocks, as a veinstone, and as a dominant constituent of sandstone (the sand grains are quartz). |
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| ecology: wildlife - plants - geography: places - MAPS - roads & trails: route 66 - old west - communities - weather - glossary |
| ghost towns - gold mines - parks & public lands: wilderness - native culture - history - geology: natural features - comments |
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