Mineral (Man Made Composite)

Crinoid Fossil Stem Segment

Class Crinoidea (Echinodermata)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (Tan/Brown variety)

Chert (Silicon Dioxide, SiO2)

Chert (specifically Jasper or Flint variety)

Cryptocrystalline Quartz (SiO2)

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Chert / Flint

Chert (varieties include Flint)

Chert

Microcrystalline Quartz (SiO2)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Marble

Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (Nodular or Massive Variety)

Cryptocrystalline Quartz (SiO2)

Chert (Grey-Green Flint)

Microcrystalline silicon dioxide (SiO2)

Granodiorite with Quartz Veining

Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins

Chert (Chocolate or Brown Flint)

Chert (SiO2)

Rose Quartz (likely carved)

Rose Quartz (SiO2)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)

Chert (often called Flint for darker varieties)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (and Jasper/Chalcedony mixture)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chalk

CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Basalt

Basalt

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Smoky Quartz

Smoky Quartz (SiO2)

White Jade (Nephrite)

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

Chert (Field-collected Arrowhead-shaped Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (specifically Gray/Blue-Gray Chert)

Chert (SiO2)

Chert (specifically Zebra Chert/Flint)

Silicon Dioxide (SiO2)

Chert (specifically Black Chert or Flint)

Cryptocrystalline Quartz (SiO2)

Garnet Beads

Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)

Chert (or Flint)

Chert (a cryptocrystalline variety of quartz, SiO2)

Chert (and Jasper/Flint variety)

Cryptocrystalline Quartz (SiO2)

Rose Quartz Carving

Quartum roseum (Variety of Quartz, SiO2)

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Lapis Lazuli

Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)

Chert (specifically Yellow/Brown Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)