Mineral Within A Sedimentary Rock

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)

Green Aventurine (Green Quartzite)

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Basalt with Iron Oxidation (Lattice/Veined)

Mafic Volcanic Rock (principally Plagioclase and Pyroxene)

Dalmatian Stone

Dalmatian Stone (a peralkaline igneous rock consisting of Feldspar, Quartz, and Arfvedsonite)

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Amethyst

Amethyst (SiO2 with Iron impurities)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Note: Item is not a geological specimen

Homo sapiens (Dermal Appendage: Pilus)

Mica Schist with Pyrite

Muscovite/Biotite Schist with Iron Sulfide (FeS2)

Desert Rose (Baryte or Selenite variant)

Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions

Chert

Microcrystalline Quartz (SiO2)

Shale (Beach-worn)

Laminated Pelite (primarily clay minerals and quartz)

Chert / Flint

Microcrystalline Quartz (SiO2)

Wonderstone (Sandstone)

Liesegang Banded Sandstone (SiO2 dominated)

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Red Jasper

Jasper (a variety of Quartz, SiO2)

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Chert (specifically Flint or Gray Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (Iron-Stained)

Microcrystalline Silica (SiO2)

Flower Jasper

Agatized Fossil Coral / Chalcedony (SiO2)

Carnelian (Red Chalcedony)

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt containing Zeolite and Calcite inclusions

Orbicular Rhyolite (Rainforest Jasper)

Rhyolite containing Spherulites (SiO2 with impurities)

Red Chert

Microcrystalline Quartz (SiO2)

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Jasper

Silicon dioxide (SiO2) with iron impurities

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Barite Rose (Desert Rose)

Barium Sulfate (BaSO4)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Chert (Nodular)

Microcrystalline Silica (SiO2)

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O

Chert / Flint Conglomerate

Silicified Sedimentary Breccia (primarily SiO2)

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Chert (often called Flint)

Chert (Microcrystalline or cryptocrystalline Silica, SiO2)

Gneiss

Gneiss

Shale

Lutaceous sedimentary rock

Desert Rose (Gypsum Variety)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Chert (specifically a weathered Chert nodule or fragment)

Chert; Microcrystalline or Cryptocrystalline Quartz (SiO2)