Rock

Lapis Lazuli

Lapis Lazuli (Complex rock primarily composed of Lazurite (Na,Ca)8[(SO4,S,Cl)2|(AlSiO4)6], Calcite, and Pyrite)

Porphyritic Basalt

Porphyritic Basalt

Sandstone

Arenite

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Quartz Vein in Sandstone

Sandstone with Hydrothermal Quartz (SiO2)

Shale (with Iron Staining)

Argillaceous mudstone / Shale

Limestone (River Pebble)

Calcium Carbonate (CaCO3)

Fossils in Limestone (Crinoid / Marine Invertebrate Fossil)

Fossiliferous Limestone (containing Crinoidea / Brachiopoda)

Limestone (Weathered Pebble)

Calcium Carbonate (CaCO3) / Limestone

Quartz-Veined Sandstone

Quartz-veined Arenite

Unakite

Epidotized Granite

Weathered quartz-bearing rock

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

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

Greywacke (River Pebble with Quartz Veins)

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

Polished greenstone pebble

Likely serpentinite or chlorite-rich greenschist

Basalt with Calcite Veins

Basalt (containing CaCO3 inclusions)

Porphyritic Basalt (River Rock)

Porphyritic Basalt

Dalmatian jasper (often sold as Dalmatian stone)

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

Sandstone

Arenite (predominantly SiO2 quartz grains)

Red Sandstone

Arenite (SiO2 with Fe2O3)

Granite

Granite (Plutonic Igneous Rock)

Glacial Cobble with Granite Inclusion

Porphyritic Basalt or Andesite containing Granitic Xenolith

Quartz with Schist Inclusion

Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist

Quartz Geode Fragment

Silicon Dioxide (SiO2)

White Topaz

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

Druzy Quartz on Chalcedony Matrix

Silicon Dioxide (SiO2)

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)

Sandstone (Quartzose)

Arenite (primarily 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

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock