Mineral, Often Found As A Rock (Metamorphic)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Quartz

Quartz (SiO2)

Garnet

Almandine formula: Fe3Al2(SiO4)3

Milky Quartz

Silicon Dioxide (SiO2)

Slate

Foliated Metamorphic Rock

Ruby (Pinkish-Red)

Corundum (Al2O3 with Chromium trace)

Quartzite with Garnet

Garnetiferous Quartzite (SiO2 + X3Y2(SiO4)3)

Quartz / Quartzite

Quartz (Silicon Dioxide, SiO2)

Arsenopyrite in Quartz/Host Rock

Arsenopyrite (FeAsS)

Chert (specifically Flint or Jasper variant)

Silicon Dioxide (SiO2)

Gneiss

High-grade metamorphic rock (Gneiss)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Rough Corundum (likely Sapphire/Zircon-bearing)

Aluminium Oxide (Al2O3)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Amethyst (Chevron or Banded variety)

Silicon Dioxide (SiO2) with iron impurities

Chert (variations include Chalcedony and Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossilized Echinoid (Sea Urchin)

Echinoidea (Class), often found as calcitic fossils

Blue Sapphire

Corundum (Al2O3)

Boxwork Quartz / Septarian Jasper

Boxwork (SiO2 with iron oxide inclusions)

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Specular Hematite

Hematite (Fe2O3)

Dragon Blood Jasper

Epidote-containing Quartz Chalcedony (SiO2 with Ca2(Al, Fe)3(SiO4)3(OH))

Chert (with Quartz Vein)

Microcrystalline silica (SiO2)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Gold-bearing Quartz

Auriferous Quartz (SiO2 with Native Gold inclusion)

Yellow Jade

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

Blue Kyanite

Kyanite (Al2SiO5)

Quartzite with Hematite

Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Schist

Mica Schist

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Clear Quartz Sphere

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Fuchsite

Fuchsite (a variety of Muscovite mica, K(Al,Cr)2(AlSi3O10)(OH)2)

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Banded River Rock / Gneiss (highly weathered)

Gneiss

Chert (often called Flint when in chalk or limestone)

Silicon Dioxide (SiO₂)

Chert (specifically Flint)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Arrowhead Debitage or Flake)

Microcrystalline silica (SiO2)