Category: Science - Earth/Agricultural/Farming
Page Introduction 5 Properties of gemstones 5 Crystals 7 Cutting and polishing of gemstones 10 Cabochon gems 10 Faceted gems 13 Tumbled gems 17 Texas gemstones 18 Amber 18 Augite 18 Beryl 18 Celestite 19 Diamond 19 Epidote 19 Fluorite 20 Fossil wood 20 Gadolinite 21 Garnet 22...
The cutting and polishing of cabochons require several steps. The initial step is sawing. Assuming that the rough gem material is large enough to be sawed (larger than about hal...
3. Part 3_Composition_: CaF₂. _Crystal system_: isometric. _Hardness_: 4. _Specific gravity_: 3.0 to 3.25. _Luster_: vitreous. _Color_: violet, blue, colorless, green, yellow, brown, ros...
5. Part 5Amorphous—without definite molecular structure; not crystalline. Baroque stone—an irregularly shaped, polished stone; usually applied to tumbled stones. Baroque pearl—an irregul...
1. Part 1Page Introduction 5 Properties of gemstones 5 Crystals 7 Cutting and polishing of gemstones 10 Cabochon gems 10 Faceted gems 13 Tumbled gems 17 Texas gemstones 18 Amber 18 Augit...
4. Part 4Some pieces of rock crystal enclosing green, needle-like actinolite crystals have been found near the Llano-Gillespie-Blanco County corner. This material is not suitable for fac...