| 1. | Chalcedony was once thought to be a fibrous variety of cryptocrystalline quartz.
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| 2. | Turquoise is nearly always cryptocrystalline and massive and assumes no definite external shape.
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| 3. | Novaculite is a form of microcrystalline or cryptocrystalline quartz.
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| 4. | Flint and chert are the most commonly knapped materials and are compact cryptocrystalline quartz.
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| 5. | These magnesites often are cryptocrystalline and contain silica in the form of opal or chert.
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| 6. | The apatite in phosphorite is present as cryptocrystalline masses referred to as " collophane ".
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| 7. | Cryptocrystalline rocks are good to use for ground stones because they have a very fine grain structure.
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| 8. | The cryptocrystalline varieties are either translucent or mostly opaque, while the transparent varieties tend to be macrocrystalline.
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| 9. | This is a cryptocrystalline form of silica, consisting of fine intergrowths of the minerals quartz and moganite.
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| 10. | Blades are created using stones that have a cryptocrystalline structure and easily be fractured into a smooth piece without fracturing.
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