Rocks & Minerals Definitions - what are the primary uses of limonite? ,Obsidian Obsidian is volcanic glass. Oligoclase Oligoclase has the formulae (Na,Ca)AlSi3O8 and a relative hardness of 7. It is a plagioclase feldspar.Crystals and Gemstones - CrystalinksCrystals and Metaphysics. Crystals are used for healing, meditation, energy work, storing information, protection, grounding, and channeling. Many have specific ,
Vanadinite - Wikipedia
Vanadinite is a mineral belonging to the apatite group of phosphates, with the chemical formula Pb 5 (V O 4) 3 Cl. It is one of the main industrial ores of the metal ......
Excalibur Mineral Corporation - Current List
Current List: Each month, we offer an abbreviated selection of minerals from our inventory of over 200,000 samples. If you don''t see what you''re ......
List of Minerals - Sandatlas
1.2 Sheet silicates (phyllosilicates) An important group of minerals, especially within the topmost 20 kilometers of the crust. All sheet silicates are hydrous....
Limonite - Wikipedia
Limonite; General; Category: Amorphous, mineraloid: Formula (repeating unit) FeO(OH)·nH 2 O: Strunz classification: Unclassified: Identification; Color: Various ......