Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Category
Not A Rock Or Mineral
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Quartz vein fragment
Milky quartz (SiO₂), with a tan, iron-stained host rock
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Sandstone
Arenite
sedimentary
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Quartz-rich mineral fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Weathered granite (likely)
Granite, a quartz–feldspar–mica intrusive igneous rock
igneous
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Granite
Intrusive igneous rock
igneous
Likely weathered iron-rich breccia or jasper
Silicified iron-oxide breccia; exact identification requires testing
sedimentary
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Gray rock (possibly basalt or fine-grained granite)
Undetermined; no diagnostic minerals are visible
igneous
Shale
Shale (clastic sedimentary rock)
Sedimentary
Quartz Vein in Sedimentary Matrix
Silicon Dioxide (SiO2) with host rock
mineral
Shale with Quartz Veins
Fissile Sedimentary Rock (SiO2)
sedimentary
Sidewalk Chalk
Calcium Carbonate (CaCO3) / Gypsum
sedimentary
Banded Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
River Cobble (Weathered Granitoid)
Granodiorite / Quartz Diorite
igneous
Sandstone
Clastic sedimentary rock (primarily quartz and feldspar grains)
sedimentary
Rock Crystal
Quartz (SiO2)
mineral
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Mixed Quartz and Mineral Gravel
Silicon Dioxide (SiO2) and assorted silicate minerals
mineral
Sandstone with Desert Varnish
Arenite (SiO2 predominantly) with Ferromanganese coating
sedimentary
River Pebble (likely Quartzite or Chert)
Sedimentary Clast (Silicon Dioxide dominant)
sedimentary
Porphyritic Basalt or Porphyritic Andesite
Porphyritic Extrusive Igneous Rock
igneous
Bubble Chalcedony
Silicon Dioxide (SiO2)
mineral
Greenstone pebble (identification uncertain from photo)
Greenstone, typically metamorphosed mafic rock composed of chlorite, actinolite, and epidote
metamorphic
Basalt (Greenstone/Water-worn Pebble)
Basalt (containing Chlorite/Epidote)
igneous
Sandstone Pebble
Sandstone (Silicon dioxide-rich clastic sedimentary rock)
sedimentary
Greenstone (likely actinolite-bearing metamorphic rock)
Actinolite-rich greenschist; exact identification requires testing
metamorphic
Epidote
Epidote, Ca2(Al,Fe)3(SiO4)3(OH)
mineral
Flagstone (likely sandstone or slate)
Flagstone is a paving form, not a single rock species; likely thin-bedded sandstone, with possible slate pieces
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Small weathered mineral/rock fragment
Unidentified; likely quartz-rich material, possibly quartzite or feldspar-bearing rock
mineral