Smoky quartz
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- The Carpenter Mineral Collection
- Amazonite and Smoky Quartz
- Chalcedony? I
- A Study on the Appearance of Quartz (PDF)
- SEMIPRECIOUS GEMSTONES and ORNAMENTAL STONES FOUND in UTAH Adapted by Martha R
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- GEM STONES Meaning and Healing Properties of the Spirit’S Widsom
- Latin Mineral Index
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- Gemmologythe Journal of Volume 35 / No
- Gems and Precious Stones of North America. a Popular Description of Their Occurrence, Value, History, Archeology, and of The
- 4 Quartz As a Mineral – Its Properties, Formation and Provenance
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- Smoky Quartz Metaphysical Properties
- Pamphlet 6 Revised 1996, 2004 Safety for Better Rockhounding
- Gem Stone Resources of South Carolina
- Mohs Scale of Mineral Hardness the Mohs Scale Was Devised by Friedrich Mohs in 1812
- Gem Stones of the United States