Man Made Material (Metal)

Tiger's Eye and Gemstone Assortment

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Chert

Microcrystalline Quartz (SiO2)

Chert Nodule

Microcrystalline Quartz (SiO2)

Diamond

Diamond (C)

Silicon Carbide (Carborundum)

Moissanite (SiC)

Chert Pebble

Chert (Silicon Dioxide, SiO2)

Chert / Flint

Silicon Dioxide (SiO2)

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (variously known as Flint)

Silicon Dioxide (SiO2)

Chert (Flint/Jasper)

Silicon dioxide (SiO2) - Microcrystalline quartz

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Kaolinite (Chalky Clay)

Kaolinite (Al2Si2O5(OH)4)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Serpentinite

Serpentinite; chiefly serpentine-group minerals (lizardite, chrysotile, antigorite), commonly with magnetite and minor talc

Red Sandstone

Arenite (Ferruginous Sandstone)

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Iron Meteorite

Siderite (Iron-Nickel Meteorite)

Yellow chalcedony (likely citrine or iron-stained quartz)

Microcrystalline quartz, SiO₂; yellow coloration likely from iron oxides or included quartz varieties

Red Sandstone

Arenite (SiO2 with Fe2O3)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Polished rhyolite (likely porphyritic rhyolite)

Rhyolite, composed chiefly of quartz and alkali feldspar with minor plagioclase, biotite, and iron oxides

Tumbled serpentine (likely)

Serpentine-group minerals, commonly lizardite or antigorite; approximate composition Mg₃Si₂O₅(OH)₄

Weathered volcanic rock, likely andesite or basalt

Fine-grained mafic to intermediate volcanic rock; probable andesite–basalt, compositionally dominated by plagioclase with pyroxene and possibly alteration minerals

Leopard Skin Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Tumbled carnelian/chalcedony

Cryptocrystalline quartz, SiO₂ (iron-bearing chalcedony)

Quartz geode / iron-stained quartz vein rock

Quartz (SiO₂), likely with iron oxides and minor feldspar or host-rock minerals

Polished jasper pebble

Jasper, microcrystalline quartz (SiO₂), commonly with iron-oxide impurities

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (River Stone)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Chert (SiO2)

Chalcedony (likely agate/chert variety)

Microcrystalline quartz, SiO₂

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Chrysocolla

Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O

Fossil scallop/bivalve shell

Fossilized pectinid bivalve; likely family Pectinidae (exact genus/species cannot be determined from the image)

Small purple quartz crystal, likely amethyst

Amethyst: violet variety of quartz, silicon dioxide (SiO₂)

Amethyst-bearing quartz (likely polished or naturally fractured)

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron-related defects

Malachite / Copper Ore

Cu2CO3(OH)2

Diamond

Carbon (C)