Garnet Schist
Garnetiferous Mica Schist
metamorphic
Category
Not A Rock (Synthetic Material)
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Boulder Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Granitic Pebble (Glacial Erratic)
Granite
igneous
Granite
Granite
Igneous
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Sandstone
Arenite
sedimentary
Stromatolite
Biogenic sedimentary rock
sedimentary
Weathered basalt or other dark volcanic rock
Likely basalt; predominantly plagioclase feldspar and pyroxene, possibly olivine and iron oxides
igneous
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Honey calcite (likely rough cleavage fragment)
Calcite, calcium carbonate (CaCO₃)
mineral
Red jasper in gray host rock (likely hematite-stained quartzite or rhyolite)
Jasper: microcrystalline quartz (SiO₂), with iron-oxide coloration; exact host uncertain from image
mineral
Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Synthetic/Byproduct (Non-igneous, non-sedimentary, non-metamorphic)
Quartzite
Quartzite (SiO2-rich metamorphic rock)
metamorphic
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)
metamorphic
Sandstone
Arenite
sedimentary
Asphalt Chunk
Asphalt concrete
man-made composite
Sandstone (with Moss)
Quartz Arenite / Sandstone
sedimentary
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Siltstone
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Granite
Felsic intrusive igneous rock
igneous
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Likely basalt pebble
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Diamond (Rough)
Diamond (Carbon, C)
Mineral
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Mg, Fe)2SiO4 (Olivine), CaAl2Si2O8 (Plagioclase Feldspar), and Pyroxene
igneous
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Banded Ironstone / Jasper Siltstone
Siltstone with Iron Oxide Hydrates (SiO2 with Fe2O3/FeO(OH))
sedimentary
Sandstone
Sandstone (SiO2 rich)
sedimentary
Quartzite with Quartz Veins
Metamorphic Quartz-rich Rock (SiO2)
metamorphic
Jasper Conglomerate
Polymictic Conglomerate (Quartz and Jasper clasts in a quartz-rich matrix)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary