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Publicidade antiga | old advertisement | 1906 Dam maze The cotton castle (2). The cotton castle. Collection of garnet crystals found in a pan after 5 days (approximately 15 hours) of panning Elbaite in quartz Geologic View of Oxia Planum Snakeskin Agate, provenance requested Sphalerite (mine near Carthage, Tennessee, USA) 2 Smoky Quartz chickpea Amethyst & purple chalcedony (Tertiary; Sulawesi, Indonesia) 2 Carlsbad Caverns, New Mexico Carlsbad Caverns, New Mexico Carlsbad Caverns, New Mexico Carlsbad Caverns, New Mexico The Incline (West Somerset Mineral Railway) The Incline (West Somerset Mineral Railway) Tanzanite - a rare gemstone: HMM “Rock” malachite Cu2CO3(OH)2, quartz - SiO2, chalcopyrite CuFeS2 Apophyllite (Nashik District, Maharashtra State, India) 1 geode malachite Cu2CO3(OH)2, quartz - SiO2, chalcopyrite CuFeS2 gypsum CaSO4·2H2O chalcedony, milky quartz - SiO2 geode Clemson University - Bob Campbell Geology Museum 07-24-2018 22 - Aragonite Clemson University - Bob Campbell Geology Museum 07-24-2018 24 - Gypsum variety Selenite Calcite with two-beam interference colors & native copper (late Mesoproterozoic mineralization age, 1.05-1.06 Ga; Upper Peninsula of Michigan, USA) 4 Calcite (Cumberland, England) 1 Topaz (Oxford Pegmatite Field; Lord Hill Quarry, Stoneham, Maine, USA) 1
Mots clés associés à mineral:
 rock, crystal, water, stone, macro, geology, quartz, gem, nature, blue
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