Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Category
Mineraloid (Man Made)
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Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Obsidian (Black)
Obsidian (High-silica volcanic glass)
igneous
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Diabase (Greenstone)
Diabase (Dolerite)
igneous
Sandstone
Arenite
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite staining)
sedimentary
Dyed Blue Agate Slice
Silicon Dioxide (SiO2)
mineral
Bog Iron / Limonite Concretion
Goethite/Limonite mixture (FeO(OH)·nH2O)
sedimentary
Banded Calcite or Travertine
Calcium Carbonate (CaCO3)
Sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Granite
Granite (felsic intrusive igneous rock)
igneous
Garnet Beads
Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)
Mineral
Limonite (Iron Ore)
Hydrous Iron Oxide (goethite, lepidocrocite)
Mineral
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
gemstone
Granite Cobble/Pebble
Granite
Igneous
Jade
Jadeite or Nephrite
Mineral/Mineraloid
Weathered iron-rich sandstone or ironstone cobble
Ferruginous sandstone/ironstone, chiefly quartz (SiO₂) cemented or stained by iron oxides and hydroxides
sedimentary
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Granite
Granite (a plutonic rock)
Igneous
BROWN GRANITE (likely 'Tan Brown' or similar)
Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)
igneous
Granite (weathered pebble)
Granite (plutonic igneous rock)
Igneous
Likely obsidian (possibly tektite or slag glass)
Volcanic glass; primarily SiO₂, noncrystalline
igneous
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
mineral
Coquina
Bioclastic Limestone
sedimentary
Quartz
Silicon Dioxide (SiO₂)
Mineral
Granodiorite
Granodiorite
Igneous
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
Igneous
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone composed of Hematite and Shell remains)
sedimentary
Tumbled blue-green stone, likely chrysocolla or dyed chalcedony
Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony
mineral
Tumbled green aventurine (probable)
Quartzite dominated by quartz (SiO₂), with green mica/fuchsite or chlorite inclusions
mineral
Nephrite Jade
Nephrite
Mineral/Rock