Sedimentary And Metamorphic Minerals

Marble

Recrystallized Limestone (CaCO3)

River Siltstone Pebble

Siltstone (primarily composed of silica and clay minerals)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Rhodonite

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

Rhodonite

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

Petrified Wood

Silicified Wood (SiO2)

Garnet (Almandine/Pyrope series)

Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)

Quartzite

Quartzite (primarily SiO₂)

Honey Calcite

Calcium Carbonate (CaCO3)

Chert (Tripolitic Chert / Flint Nodules)

Microcrystalline Quartz (SiO2)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Epidote (Unakite-related)

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

Jasper

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (primarily SiO₂ / Silicon Dioxide)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Jade

Jadeite or Nephrite (both are commonly referred to as 'jade'). Jadeite: NaAlSi2O6; Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2.

Serpentine

Serpentinite (composed mainly of Group Minerals Antigorite, Chrysotile, and Lizardite; Mg3Si2O5(OH)4)

Anthracite Coal

Anthracite

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Gneiss

High-grade foliated metamorphic rock

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Jasper

Jasper (Silicon Dioxide, SiO2)

Jasper (Red Jasper)

Silicon Dioxide (SiO2) with Hematite inclusions

Yellow Jasper

Jasper, a microcrystalline variety of Quartz (SiO2) with iron inclusions

Jasper

Silicon dioxide (SiO2) with impurities

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Sandstone

Arenite (primarily SiO2 with hematite/iron oxide coating)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Sandstone with Liesegang Rings

Arenite with Iron Oxide Liesegang Banding

Septarian Nodule (Thunder Egg)

Septarian Concretion (CaCO3 + CaMg(CO3)2 + SiO2)

Gastropod Fossil (Snail Internal Mold)

Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)

Septarian Nodule (Septarian Dragon Stone)

Septarian Concretion (CaCO3 + Al2Si2O5(OH)4)

Chert (Green variety)

Microcrystalline Opaline/Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (variations include Flint/Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variations include Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Quartz (Tumbled/Polished Pebble)

Silicon Dioxide (SiO2)

Dumortierite Quartz

Al7BO3(SiO4)3O3 (Aluminum borate silicate)

Petrified Wood

Silicified Wood (SiO2)

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)