Metamorphic Or Sedimentary Depending On Local Grade

Citrine Quartz Crystal Cluster

Silicon Dioxide (SiO2) with iron impurities

Conglomerate

Conglomerate (clastic sedimentary rock)

Garnet in Schist (Mica Schist with Garnet Inclusion)

Garnetiferous Mica Schist (X3Al2(SiO4)3)

Gneiss

High-grade Metamorphic Gneiss

Black Opal

Amorphous hydrated silica (SiO2 nH2O)

Nephrite Jade

Tremolite-actinolite series (Ca2(Mg,Fe)5Si8O22(OH)2)

Green Tiger's Eye

Silicified Crocidolite (Quartz variety, SiO2)

Gneiss

Metamorphic Gneiss

Dark slate or fine-grained metamorphic rock

Slate; chiefly fine-grained phyllosilicates, quartz, and feldspar

Conglomerate

Conglomerate rock

Pink Quartzite

Quartzite (primarily SiO2)

Dark gray metamorphic rock, likely slate or phyllite

Slate/phyllite; commonly quartz–mica–chlorite aggregate

Polished black slate or schist slab

Slate/schist, composed mainly of fine-grained mica, quartz, and chlorite

Larimar

Pectolite (NaCa2Si3O8(OH))

White Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

Gneiss (likely banded granitic gneiss)

Quartz–feldspar–mica gneiss; commonly containing biotite and hornblende

Quartz

Silicon Dioxide (SiO2)

White quartz-rich rock, possibly milky quartz

Quartz (SiO₂), possibly quartzite or calcite-bearing material

Tumbled purple-blue corundum, possibly sapphire

Corundum (Al₂O₃); blue-to-purple varieties are sapphire

Garnet in Matrix

Almandine or Spessartine Garnet in Quartz/Schist Matrix (X3Al2(SiO4)3)

Black Opal

Hydrated silica (SiO2·nH2O)

Weathered porphyritic volcanic rock

Likely porphyritic andesite or basalt; exact identification requires a fresh surface and testing

Quartz Veined Mudstone

Metasedimentary rock with Quartz (SiO2) veins

Gneiss

Gneiss (High-grade metamorphic rock)

Mica schist, likely biotite–muscovite schist

Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.

Serpentine

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Weathered schist or phyllite

Mica-rich pelitic metamorphic rock; commonly quartz–muscovite/biotite schist or phyllite

Chert (Arrowhead Fragment)

Silicon Dioxide (SiO2)

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (predominantly Lazurite)

Banded Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Metamorphic Foliated Gneiss

Gneiss

Gneiss (Metamorphic Rock)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Dragon Blood Jasper

SiO2

Tumbled gray stone, likely slate or fine-grained metamorphic rock

Probable slate/phyllite; composition mainly quartz, mica, and feldspar

Unakite (likely)

Epidote–orthoclase–quartz rock; composition approximately epidote Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH) plus K-feldspar and quartz

Veined marble or calcitic limestone

Calcite-dominant carbonate rock (CaCO₃), likely marble

Biotite mica schist (probable)

Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂) with quartz and feldspar

Beach Quartz Pebble

Quartz (Silica - SiO2)

Emerald

Beryl (Be3Al2Si6O18 with chromium and vanadium impurities)

Ironstone / Gossan with Quartz Inclusions

Limonite / Goethite rich Sandstone / Gossan

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)