Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Category
Sedimentary Or Igneous (Host Environment)
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Quartz (Crystalline Cluster)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Quartz-veined metamorphic rock, likely schist or gneiss
Quartz–feldspar–mica rock; exact identification requires testing
metamorphic
Small white quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO₂)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartz with Pyrite
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Weathered schist or gneiss boulder
Micaceous quartz-feldspar schist/gneiss; exact identification is limited by the photograph
metamorphic
Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral
Silver-colored mica schist
Muscovite–quartz schist, possibly with biotite
metamorphic
Rose quartz
Quartz (silicon dioxide, SiO₂), pink variety
mineral
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
mineral
Weathered rock fragment (likely granite or quartz-rich sandstone)
Uncertain; possible granitic fragment containing quartz and feldspar
igneous
Limestone (with potential fossil inclusions)
Calcium Carbonate (CaCO3)
sedimentary
Quartz-veined Siltstone/Greywacke
Clastic Sedimentary Rock with Quartz Infill (SiO2 vein)
sedimentary
Quartz Pebble
Crystalline Silica (SiO2)
sedimentary
Sandstone Concretion
Sedimentary Concretion (Quartz sand bound by mineral cement)
sedimentary
Native Copper in Basalt
Cuprum (with Host Basalt)
igneous
Vesicular basalt (likely weathered lava rock)
Basalt; fine-grained mafic volcanic rock composed chiefly of plagioclase, pyroxene, and commonly olivine
igneous
Pyritic Gneiss
Metamorphic Gneiss with Pyrite inclusions
metamorphic
Weathered iron-rich rock, possibly basalt or limonite-bearing sandstone
Undetermined; likely Fe-oxide-stained basalt or ferruginous sandstone (hematite/goethite-bearing)
igneous
Chert (Jasper type)
Microcrystalline Quartz (SiO2)
sedimentary
Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Botryoidal Chalcedony / Quartz
Silicon Dioxide (SiO2)
mineral
Calcite in Matrix
Calcium Carbonate (CaCO3) on Sedimentary Host Rock
mineral
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Gneiss with Quartz Veining
Gneiss (High-grade regional metamorphic rock)
metamorphic
Unidentified orange-brown rock fragment
Likely weathered iron-rich volcanic rock or ochre-bearing material; exact identification is impossible from the blurred image
igneous
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral
Red Granite Pebble
Intrusive Felsic Igneous Rock (Granite)
igneous
Polished malachite
Malachite, Cu₂CO₃(OH)₂
mineral
Red Garnet Gemstone
Pyrope-Almandine Garnet (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
gemstone
Sandstone Concretion
Sedimentary concretion
Sedimentary
Orca Agate
Chalcedony (SiO2) with various inclusions
mineral
Pegmatite with Quartz and Feldspar
Intrusive Igneous Rock
igneous
Red Jasper with Quartz
Microcrystalline Quartz (SiO2)
sedimentary