Sedimentary And Metamorphic Minerals

Chert (specifically Flint)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Chert (Chert / Flint nodule)

Silicon Dioxide (SiO2)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (specifically Jasper or Flint)

Microcrystalline or Cryptocrystalline Quartz (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.

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

Epidosite

Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})

Serpentine

Serpentinite (group of minerals including Antigorite, Lizardite, or Chrysotile) (Mg, Fe)3Si2O5(OH)4

Banded Iron Formation (BIF)

Banded Iron Formation (composed primarily of Hematite [Fe2O3], Magnetite [Fe3O4], and Chert [SiO2])

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with iridescent tarnish

Rutilated Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2 with Epidote/Tourmaline inclusions

Green Aventurine (Tumbled Quartzite)

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Orange Calcite

Calcium Carbonate (CaCO3)

Green Banded Chert (Agate/Jasper)

Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Biotite Mica

K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2

Rhodonite in Matrix

Rhodonite (Manganese Silicate) - (Mn2+,Fe2+,Mg,Ca)SiO3

Rhodonite

Rhodonite (Mn, Fe, Mg, Ca)SiO3

Shale

Shale (composition varies: primarily clay minerals and quartz)

Chert (or possibly Flint)

SiO2 (Silicon Dioxide)

Biotite Mica in Host Rock

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Tiger's Eye and Carnelian Quartz

Silicon Dioxide (SiO2)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Halite

Halite (Sodium Chloride, NaCl)

Quartzite (River Stone)

Quartzite (mainly SiO2 with iron oxide staining)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Fossilized Sand Tiger Shark Tooth

Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Red Jade (Dyed Quartzite)

Silicon Dioxide (SiO2) - variety Quartzite

Quartzite River Stone

Metamorphosed Quartz-rich Sandstone (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite (or Iron-Stained Quartz Pebble)

Silicon Dioxide (SiO2) with Ferric Oxide inclusions

White Marble

Recrystallized Calcite (CaCO3)

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

Jasper (Petrified Wood variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Sandstone

Ferruginous Sandstone (SiO2 dominated with Fe2O3 cement)

Ferruginous Conglomerate

Conglomerate with Iron-Oxide Matrix (SiO2 + Fe2O3/FeO(OH))

Banded Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)