Industrial Byproduct (Anthropogenic Rock Like Material)

Bauxite

Bauxite (Al(OH)3, AlO(OH), AlOOH)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of chalcedony (SiO₂), with iron-oxide staining

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (varietal Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chalcedony

Silicon dioxide (SiO2)

Pegmatite

Pegmatite (Coarse-grained igneous rock)

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Quartz Vein in Host Rock

Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)

Natural turquoise-bearing rock

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a limonite or host-rock matrix

Quartz vein in weathered host rock

Likely milky quartz (SiO₂) with iron-oxide staining and altered host rock; exact rock cannot be determined from the photo

Sandstone

Sedimentary rock composed mainly of quartz sand

Schist

Mica Schist

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Shark Tooth Fossil

Chondrichthyes fossil

Tumbled yellow jasper (probable)

Jasper, an opaque microcrystalline variety of quartz; chiefly SiO₂ with iron-oxide inclusions

Sandstone

Clastic Sedimentary Rock

Likely basalt pebble

Basalt, a fine-grained mafic volcanic rock; commonly composed of plagioclase, pyroxene, and sometimes olivine

Cobalt Blue Sea Glass

Amorphous Silica Glass (SiO2 + CoO)

Schist

Mica Schist

Coal (Bituminous)

Organic sedimentary rock primarily consisting of carbon (C)

Clear quartz crystal pendant

Quartz (silicon dioxide, SiO₂)

Fossil Snail

Gastropoda fossil

Sedimentary Rock (Limestone or Siltstone pebble)

Sedimentary rock fragment

Weathered iron-rich rock, possibly limonite-bearing basalt or laterite

Indeterminate; likely Fe-oxide/hydroxide–altered mafic rock, dominated by limonite/goethite with silicate minerals

Petrified Wood

Silicified wood (permineralized organic tissue)

Likely weathered quartz-rich rock fragment

Indeterminate; possibly quartz-bearing sandstone or chert with iron-oxide staining

Vesicular basalt (likely weathered scoria)

Mafic volcanic rock; chiefly plagioclase, pyroxene, and often olivine, with abundant gas vesicles

Potassium-Rich Silicate Clay (inferred from biological context)

Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)

Red Sandstone

Arenite (SiO2 with Fe2O3)

Sandstone (Pebble)

Sandstone (SiO2 dominated clastic sedimentary rock)

Possible basaltic rock or meteorite candidate

Likely vesicular basalt; meteorite identification cannot be confirmed visually

Schist

Schist (variety likely Mica Schist)

Banded Gneiss

Gneiss (Metamorphic rock)

Small gray-green stone, likely a quartz-rich rock fragment

Undetermined silicate rock; image lacks enough detail for a reliable species-level identification

Landscaping Gravel / River Rock

Polymictic Gravel Aggregates

Coal (Bituminous / Anthracite)

Carbonaceous Sedimentary Rock (C)

Unidentified weathered rock, possibly quartz-bearing granite or rhyolite

Indeterminate; likely quartz–feldspar-rich silicate rock

Wavellite with Quartz

Al3(PO4)2(OH,F)3 & SiO2

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

Diamond (in jewelry setting)

Cubic Carbon (C)

Pumice

Pumice (Vesicular Felsic Glass)