Mineral, Often Found As A Rock (Metamorphic)

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) / Goethite

Ruby in Zoisite with Hornblende

Anyolite (Ruby: Al2O3, Zoisite: Ca2Al3(SiO4)3(OH))

Chert (variously identified as Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Gold Ore

Native Gold (Au) in Matrix

Chert (Nodule)

Chert (Microcrystalline Quartz, SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within metamorphic/igneous matrix

White Quartz

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (SiO2)

Serpentinite (often containing Jadeite/Nephrite)

Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4

Milky Quartz

Silicon Dioxide (SiO2)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Quartz (Milky/Common)

Quartz (Silicon Dioxide, SiO2)

Jasper-Quartz Conglomerate / Chert

Siliceous Sedimentary Rock (SiO2)

Gneiss

High-grade foliated metamorphic rock

Green Jasper

Silicon Dioxide (SiO2) with impurities

Unakite (Tumbled)

Unakite (altered granite)

Chert (Flint)

Chert (SiO2)

Tiger's Eye (Brown/Dark variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Milky Quartz

Silicon Dioxide (SiO2)

Dragon Blood Jasper (Epidote with Piedmontite or Quartz)

Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (a type of metamorphic rock)

Blue Sapphire (Tumbled/Polished)

Corundum (Al2O3)

Unakite or Epidosite

Epidosite (Mineral composition: Epidote, Feldspar, and Quartz)

Gneiss (Metamorphic Rock)

Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)

Milky Quartz

Silicon Dioxide (SiO2)

Garnet (almandine or pyrope variety)

Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3

Chert (White Flint)

Microcrystalline Quartz (SiO2)

Green Quartzite (Aventurine-like)

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

Limonite

Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Chert (Basanite variety) with Quartz Vein

Microcrystalline Quartz (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions

Banded Agate (Polished Slice)

Chalcedony (cryptocrystalline Quartz), SiO2

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Chert (Tan/Grey)

Chert (Silicon Dioxide, SiO2)

Blue Lace Agate

Agate (Variety of Chalcedony, SiO2)