Mineral, Often Found As Detrital Grains In Sedimentary Rocks

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Schist (Biotite/Mica Schist)

Medium-grade regional metamorphic rock (rich in Phyllosilicates)

Quartzite

Quartzite (SiO2)

Quartz River Cobble

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide impurities

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Quartz Geode (likely within Limestone or Dolomite matrix)

Quartz (SiO₂)

Gneiss (with Quartz and Biotite Mica)

Gneiss

Rhodonite

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

Fossiliferous Sandstone (with Brachiopod or Bivalve mold)

Clastic Sedimentary Rock with Macrofossil Mold

Chert (Smoky variety)

Microcrystalline Quartz (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Stichtite in Serpentine (Atlantasite)

Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture

Granitic Pegmatite

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)

Quartzite

Quartzite (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Kyanite

Kyanite (Al2SiO5)

Jasper

Silicon dioxide (SiO2)

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)

Porphyritic Basalt (primarily SiO2, Al2O3, FeO, MgO, CaO)

Schist

Mica Schist

Granite

Phaneritic Felsic Igneous Rock (Granite)

Hag Stone

Perforated Sandstone (composed of SiO2 and calcareous cement)

Basalt

Basalt (Mafic volcanic rock)

Petrified Wood

Silicified Wood (SiO2)

Granodiorite

Granodiorite (containing Quartz, Plagioclase Feldspar, Biotite, and Hornblende)

Smoky Quartz

SiO2 (Silicon Dioxide)

Red Shale

Lutite (primarily composed of clay minerals and iron oxides like hematite, Fe2O3)

Limonite Concretion

Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O

Sapphire (Raw/Rough)

Corundum (Al2O3)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

White Moonstone (Scolicite or White Feldspar var. )

Lattice-structure Silicate (KAlSi3O8)

Lazulite

Magnesium Aluminum Phosphate Hydroxide (MgAl2(PO4)2(OH)2)