Banded Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Category
Industrial Byproduct
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Orange Calcite (with White Calcite/Quartz matrix)
Calcium Carbonate (CaCO3)
mineral
Basalt
Basalt (containing Pyroxene and Plagioclase Feldspar)
igneous
River Stone (Quartzite)
Metamorphic Quartzite (primarily SiO2)
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Schist
Mica Schist (Quartz-Muscovite-Biotite Schist)
metamorphic
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Fluorite (Green)
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartzite (Water-worn Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt with Sulfide/Pyrite inclusion
Aphanitic Mafic Igneous Rock (likely Basalt) with Pyrite (FeS2)
igneous
Rose Quartz Beads
SiO2 (Silicon Dioxide with trace inclusions of Ti, Fe, or Mn)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Metamorphic or Igneous (context dependent)
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Native Copper
Native Copper (Cu)
mineral
Black Tourmaline in Quartz Matrix
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) with Quartz (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble with Chert
Silicon Dioxide (SiO2)
mineral
Granite
Plutonic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pumice (specifically a water-worn, weathered variety)
Vesicular volcanic glass
igneous
Smoky Quartz
Smoky Quartz (SiO2: Silicon Dioxide)
mineral
Chalcedony (specifically Agate or Moonstone-like Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (with inclusions)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz (part of a Geode)
Silicon Dioxide (SiO2)
mineral
Lake Superior Agate
Banded Chalcedony (SiO2)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Quartzite with Quartz Veining
Quartzite (consisting primarily of SiO2)
metamorphic
River Quartzite / Tumble-Polished Quartz
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Schist
Mica Schist (Group of medium-grade metamorphic rocks)
metamorphic
Sapphire
Corundum (Al2O3)
mineral
Corundum (Sapphire)
Corundum (Al2O3)
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral