Small weathered mineral/rock fragment
Uncertain from image; possibly quartz-rich sandstone or a feldspar-bearing rock
mineral
Category
Sedimentary Or Igneous (Host Environment)
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Quartz
Silicon Dioxide (SiO2)
mineral
Weathered schist or gneiss fragment
Quartz–feldspar–mica metamorphic rock; likely mica schist or gneiss
metamorphic
Quartz Veined Siltstone
Siltstone with Quartz (SiO2) intrusion
sedimentary
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(F,OH)2
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
Mineral
Tumbled amethyst
Amethyst, purple variety of quartz (SiO₂)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Carnelian (Chalcedony)
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
mineral
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
mineral
Quartz (Pink/Rose Quartz or Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Quartz (Milky Quartz/Citrine Type)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Weathered foliated metamorphic rock, likely schist or gneiss
Micaceous schist/gneiss; composition likely quartz, feldspar, mica, and altered mafic minerals
metamorphic
Unopened Geode
Geode (containing various mineralization like Quartz SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal (specifically a small Clear Quartz point)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst Quartz
SiO2 (Silicon Dioxide)
Mineral
Quartz-rich mineral fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Quartz River Rock
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Geode
Quartz / Chalcedony nodule
sedimentary
Quartz-veined altered rock
Likely quartz-bearing metasediment or altered igneous rock; vein mineral: quartz (SiO₂)
metamorphic
Brown Agate
Silicon Dioxide (SiO2)
mineral
Raw Agate (Chalcedony Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Sandstone with Desert Varnish
Arenite (SiO2 predominantly) with Ferromanganese coating
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz vein in weathered host rock
Quartz (SiO₂), likely in a weathered metamorphic or igneous matrix
mineral
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) with varying mineral impurities
sedimentary
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral