Quartz provides the best scepter crystals. Also see reverse scepter. SEM Scanning electron microscope, very useful equipment for taking pictures of very very small crystals. SG Specific gravity silver pick Collecting with the silver pick means buying specimens. An unusually underpriced specimen, a real treat to find but fairly rare.
Knowledgeable collectors can spot sleepers from across the room, in the dark.
Short wave ultraviolet light. The end of a crystal, preferably with faces. Unterminated crystals are undesirable. A roughly spherical solid nodule of quartz, often colorfully patterned. Basically an irregular hole, in rock.