Serpentine (Serpentinite)
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe)2O5(OH)4)
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Fluorescent glassy mineral specimen, possibly hyalite opal
Hyalite (hydrated amorphous silica, SiO₂·nH₂O), tentative
mineral
Unidentified mineral specimen, possibly quartz-bearing rock
Undetermined from the photograph; no diagnostic mineral or rock name can be assigned reliably.
mineral
Sandstone Pebble
Sandstone (primarily Quartz, SiO2)
sedimentary
Slate
Foliated Metamorphic Rock
metamorphic
Obsidian Arrowhead
Volcanic Glass (Primary composition: SiO2)
igneous
Tumbled black-and-white stone, likely dendritic agate or jasper
Cryptocrystalline quartz (SiO₂), possibly chalcedony with manganese-oxide dendrites
mineral
Sandstone
Sedimentary Rock
sedimentary
Gneiss
Metamorphic Gneiss
metamorphic
Sandstone Pebble
Sandstone (primarily SiO2)
sedimentary
Banded Agate
Chalcedony / Silicon Dioxide (SiO2)
mineral
Serpentinite (probable)
Serpentinite, a rock composed chiefly of serpentine-group minerals such as antigorite, lizardite, or chrysotile
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Banded)
Clastic Sedimentary Rock (composed of SiO2, CaCO3, or Fe2O3 cement)
sedimentary
Diamond
Native Carbon (C)
mineral
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Likely mica schist
Mica-rich schist, likely muscovite/biotite with quartz and possibly feldspar
metamorphic
Pumice
Pumice (a highly vesicular, silicic volcanic rock)
igneous
Likely tumbled lepidolite-bearing mica schist
Lepidolite-rich mica schist; chiefly lepidolite/muscovite mica, quartz, and possibly feldspar
metamorphic
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
metamorphic
Raw green chalcedony (likely chrysoprase or prehnite)
Microcrystalline quartz, SiO₂; possible prehnite, Ca₂Al₂Si₃O₁₀(OH)₂
mineral
Peridot (Olivine)
Olivine, (Mg, Fe)2SiO4
mineral
Tumbled amethyst
Amethyst, purple quartz (SiO₂)
gemstone
Gneissic Granite
Granite Gneiss
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Mudstone
Argillite
sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Raw amethyst quartz crystal
Quartz, silicon dioxide (SiO₂), purple variety amethyst
mineral
Mixed rock collection
Labeled specimens appear to include iron-rich rock, schist, basalt, serpentinite, and shale
igneous, sedimentary, metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) vein cutting through host rock
mineral
Rounded quartz-rich pebble
Lithic pebble; likely quartz/quartzite with iron-oxide staining
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Chert (variations include Flint/Jasper)
Chert (SiO2)
sedimentary
Cowrie shell
Marine gastropod shell; likely a cowrie (family Cypraeidae), species not identifiable from the image
fossil
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite
sedimentary