Conglomerate
Conglomerate (Sedimentary rock, clastic)
sedimentary
Category
Sedimentary (Base), Then Artificial
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Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Generic Rock Fragment
Rock Fragment
sedimentary
Shark Tooth Fossil
Otodus sp. (possibly Cretalamna)
fossil
Sandstone (with Moss/Lichen Growth)
Sandstone (Quartz Arenite / Lithic Arenite)
sedimentary
Fossilized Shark Tooth
Selachimorpha fossil
fossil
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Montana Moss Agate
Chalcedony (SiO2) with Manganese/Iron oxide inclusions
sedimentary
Granite Sand (Decomposed Granite)
Grus / Quartz-Feldspar Detritus
sedimentary
Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)
Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)
metamorphic
Chalcedony with Quartz Crystals
Silicon Dioxide (SiO2)
mineral
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Siltstone
Siltstone
sedimentary
Crushed Limestone
Sedimentary Calcite/Dolomite Rock (CaCO3)
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Mixed gemstone jewelry collection
Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline
gemstone
Weathered mica-rich rock (tentative identification)
Possibly mica schist or phyllite; exact identification requires closer examination
metamorphic
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (Flint)
Cryptocrystalline Silica (SiO2)
sedimentary
Crushed Limestone
Limestone (CaCO3)
sedimentary
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Sandstone Pebble (River Cobble)
Arenite (Sandstone)
sedimentary
Limestone
Calcite rock (CaCO3)
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Chert (Nodule)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Silty Sand / Loam
Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Ferruginous Sandstone Pebble
Arenite with Iron Oxide matrix
sedimentary
Coquina
Biogenic Limestone (CaCO3)
sedimentary
Chert / River Cobble
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
sedimentary
Limestone (specifically Iron-stained or Argillaceous Limestone)
Calcium Carbonate (CaCO3) with Iron Oxide (Fe2O3) impurities
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary