Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Category
Metamorphic Rock (Composed Of Multiple Minerals)
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Siltstone with Weathering Rind
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Shale or Slate with Quartz Veins
Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins
Metamorphic, likely Sedimentary with Quartz veins
Schist
Schist
metamorphic
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Unakite
Epidote-Feldspar rock
Metamorphic Rock
Slate
Slate (Foliated metamorphic rock consisting mainly of quartz and muscovite or illite)
metamorphic
Basalt
Extrusive mafic igneous rock
igneous
Banded Gneiss
Gneiss (pronounced "nice")
metamorphic
Quartzite (specifically an iron-stained or Carnelian-colored variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
Sandstone (Yellow/Tan)
Clastic sedimentary rock (primarily SiO2 with iron oxide staining)
sedimentary
Granite
Granite
Igneous
Copper-bearing Mica Schist
Mica Schist with Native Copper inclusions
metamorphic
Schist
Chlorite/Mica Schist
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Gneiss (with iron staining)
Gneiss
metamorphic
Diamond
Diamond (pure Carbon, C)
mineral
Sandstone Pebbles
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Rhodonite
Manganese silicate (MnSiO3)
mineral
Quartz with inclusions (likely Chlorite or Hornblende) and country rock
SiO2 (Quartz) with associated ferromagnesian minerals
Mineral/Igneous/Metamorphic association
Lapis Lazuli
Complex mixture of minerals (lazurite, calcite, pyrite, and sodalite); (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Quartz
Quartz (SiO2)
Mineral
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Greenstone / River Jadeite pebble
Metavolcanic rock / Chlorite or Actinolite-rich schist
metamorphic
Schist
Schist (various mineral compositions)
Metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Quartzite (with mineral vein)
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Granite
Granite
igneous
Basalt
Basalt
igneous
Greenschist (Chlorite Schist)
Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)
metamorphic
Granite Pebble (River Rock)
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Basalt
Basalt
igneous
Basalt
Basalt (principally Plagioclase and Pyroxene)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Mica Schist
Muscovite/Biotite Schist
metamorphic
Schist
Mica Schist
metamorphic