Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Bauxite

Bauxite (principal ore of aluminum, primarily Al(OH)3)

Slate

Foliated Metamorphic Rock (composed mainly of clay minerals or micas)

Greenstone

Greenschist (composed of chlorite, actinolite, and epidote)

Snowflake Obsidian

Obsidian with Cristobalite inclusions

Biotite-bearing gneiss (probable)

Foliated metamorphic rock composed chiefly of quartz, feldspar, and dark biotite/amphibole

Porphyry (specifically Porphyritic Rhyolite or Andesite)

Porphyritic Igneous Rock (composed of Phenocrysts in an Aphanitic groundmass)

Granite

Granite (Phaneritic Igneous Rock)

Red-and-gray granitic gneiss

Gneiss, composed mainly of quartz, feldspar, and mica with iron-oxide staining

Ventifact

Eolian Ventifact (often composed of basalt, chert, or quartzite)

Weathered dark volcanic rock, likely basalt

Basalt; fine-grained mafic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Emerald in Matrix (Quartz/Schist)

Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

Black slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals, chlorite, and quartz

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Pink Granite

Phaneritic intrusive igneous rock with Potassium Feldspar (KAlSi3O8) and Quartz (SiO2)

Mica-rich schist

Quartz–muscovite/biotite schist

Quartz cluster, possibly druzy quartz on matrix

Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Tumbled green aventurine (probable)

Quartzite composed chiefly of quartz (SiO₂), with green fuchsite or other mica inclusions

Unakite

Epidote-Feldspar rock

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

Lapis Lazuli

Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Slate

Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)

River Cobble (Gneiss/Migmatite)

Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)

Dalmatian Jasper

Peralkaline Feldspar Diorite/Rhyolite

Likely banded gneiss

Gneiss, a foliated metamorphic rock composed chiefly of quartz, feldspar, and mica

Granite

Intrusive Igneous Rock

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

Chert (Jasper-rich)

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of minerals in the Serpentine group: Chrysotile, Lizardite, and Antigorite)

Gravel and Pebbles

Unconsolidated rock fragments / detrital sediment

Quartz (specifically Milky/Gray Quartz)

Silicon Dioxide (SiO2)

Polished unakite

Unakite; altered granite composed mainly of epidote, pink potassium feldspar, and quartz

Granite with Pyrite or Mica

Phaneritic intrusive igneous rock

Granite

Phaneritic Felsic Igneous Rock

Dalmatian Stone and Lapis Lazuli

Dalmatian Stone (peralkaline rock) with Lapis Lazuli (metamorphic rock)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, e.g., Lizardite, Chrysotile, Antigorite)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Orange Calcite

Calcium Carbonate (CaCO3)

Quartzite pebble

Quartzite (composed primarily of Quartz, SiO2)

Serpentinite

Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)