Not A Rock

Basalt with Iron Oxidation (Lattice/Veined)

Mafic Volcanic Rock (principally Plagioclase and Pyroxene)

Basalt with Quartz/Calcite Veins

Aphanitic Mafic Igneous Rock (Hydrothermal Veined)

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Conglomerate

Conglomerate (Detrital Sedimentary Rock)

Vesicular Basalt (Scoria)

Vesicular Basalt

Weathered iron-rich rock fragment

Likely limonite/goethite with hematite and iron-bearing silicates; exact identification requires testing

Rough turquoise-bearing rock (probable turquoise matrix)

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

Basalt

Extrusive igneous rock

Quartz-rich rock fragment

Likely quartz vein material, predominantly quartz (SiO₂); identification is tentative from the image

Sandstone

Arenite (predominantly SiO2 quartz grains)

Porphyritic Basalt

Porphyritic Basalt

Small gray rock fragment

Undetermined; likely a common silicate-rich stone or concrete/road aggregate fragment

Quartz Vein in Sandstone

Sandstone with Hydrothermal Quartz (SiO2)

Porrphyritic pink granite (weathered)

Granite, commonly composed of quartz, alkali feldspar, plagioclase, and biotite/hornblende

Lichen-covered granite or granitic gneiss

Granite: quartz + feldspar + mica; possibly gneiss if foliation is confirmed

Rounded weathered pebble

Likely fine-grained sandstone, siltstone, or weathered volcanic rock; exact identification is uncertain from the image

Banded gneiss (likely biotite-bearing)

Gneiss; quartz–feldspar–mica assemblage, with possible iron-oxide staining

Rounded sandstone pebble

Quartz-rich sandstone, commonly arkose or lithic sandstone

Veined Grey Metamorphic Pebble

Quartzo-feldspathic vein in Metabasalt / Serpentinite / Slate

Honey calcite (likely rough cleavage fragment)

Calcite, calcium carbonate (CaCO₃)

Quartz-veined Metamorphic Rock

Quartz-veined Schist or Gneiss

Quartzite River Rock

Quartzite (primarily SiO2)

Likely bituminous coal

Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image

Dalmatian jasper (often sold as Dalmatian stone)

Porphyritic alkali feldspar–quartz syenite, commonly with black arfvedsonite/aegirine-group amphibole inclusions

Quartz with Schist Inclusion

Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist

Greenstone (likely metamorphosed mafic rock)

Probable chlorite–actinolite–epidote-rich metabasalt; exact identification requires testing

Greywacke (River Pebble with Quartz Veins)

Greywacke (Indurated Sandstone); Veins: SiO2 (Quartz)

Polished greenstone pebble

Likely serpentinite or chlorite-rich greenschist

Druzy Quartz on Chalcedony Matrix

Silicon Dioxide (SiO2)

Greenstone, likely altered basalt (possibly serpentinite)

Metabasalt/greenschist; commonly chlorite–actinolite–epidote ± serpentine

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Weathered quartz-bearing rock

Quartz-rich vein material; likely quartz with iron oxides and feldspar, exact rock type uncertain

Quartz Geode Fragment

Silicon Dioxide (SiO2)

White Topaz

Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2

Banded metamorphic rock, likely gneiss or metasedimentary slate

Quartz–feldspar–mica gneiss (tentative), possibly containing iron-oxide veins

Sandstone and Conglomerate pebbles

Sedimentary clastic rock

Sandstone (Iron-stained)

Arenite with Limonite/Hematite staining

Weathered quartz-rich pebble

Milky quartz, SiO₂, possibly quartzite or quartz-veined rock

Small polished or naturally worn stone, possibly quartz-bearing rock

Indeterminate from the blurred image; likely quartz (SiO₂) or a pale feldspar-rich fragment

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

Snakeskin Jasper

Microcrystalline Quartz (SiO2) with iron inclusions

Agate (Common Chalcedony)

Silicon Dioxide (SiO2)