Mineral, Often Found As A Rock (Metamorphic)

Yellow Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Yellow Quartzite Pebble

Quartzite (SiO2)

Citrine

SiO2 (Silicon Dioxide)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions

Blue Tiger's Eye

Crocidolite in Quartz (altered)

Quartzite

Quartzite (SiO2)

Lapis Lazuli (in Matrix)

Na8[Al6Si6O24]S2 (Lazurite as the primary component)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite (River Pebble)

Metamorphic Quartz (SiO2)

Orange Quartzite (Tumbled)

Quartzite (SiO2)

Yellow Jade (often Serpentine or Dolomite)

Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Quartzite

Quartzite (SiO2)

Druzy Quartz on Chert/Chalcedony

Silicon Dioxide (SiO2)

Gneiss (Metamorphic Rock)

Gneiss

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Quartz on Greenstone

Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit

Quartzite

Quartzite (primarily SiO2)

Greenstone / Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)

Green Aventurine

Aventurine Quartz (SiO2 with fuchsite inclusions)

Quartz Vein in Host Rock (Pebble)

Quartz (SiO2) with sandstone or siltstone matrix

Quartzite

Quartzite (primarily SiO2)

Rhodonite

Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3

Raw Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Banded Gneiss

Gneiss (pronounced "nice")

Quartzite

Quartzite (SiO2)

Serpentine

Antigorite / Lizardite / Chrysotile [(Mg,Fe)3Si2O5(OH)4]

Quartzite

Quartzite (primarily SiO2)

Diopside (likely Chromian Diopside)

Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Red Jasper or Chert

Jasper (SiO2, a variety of chalcedony with iron oxide impurities), Chert (SiO2)

Garnet-Bearing Schist

Almandine Garnet Micaceous Schist

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Milky Quartz

Silicon Dioxide (SiO2)

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Granitic Pegmatite

Granitic Pegmatite with Quartz and Feldspar

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Green Quartz (Aventurine)

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite

Quartzite (primarily SiO2)

Eclogite

Eclogite (Pyrope-Omphacite rock)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)