Sedimentary (Chemically Precipitated) Or Metamorphic

Calcite

Calcium Carbonate (CaCO3)

Chert or Chalcedony

Microcrystalline Quartz (SiO2)

Muscovite Mica (in Quartz matrix)

Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)

Quartz-rich rock, likely milky quartz vein material

Quartz (SiO₂), possibly iron-stained massive quartz with minor feldspar or mica

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Banded Iron Formation (BIF)

Banded Iron Formation

Quartzite Pebble

Quartzite (SiO2)

Nephrite Jade

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

Blue Quartzite

Quartzite (primarily SiO2 with inclusions like Dumortierite or Magnesio-riebeckite)

Quartzite

Quartzite (Primary mineral: SiO2)

Basalt with Quartz Vein

Basalt (fine-grained mafic igneous rock) with crystalline Quartz (SiO2)

Quartzite

Quartzite (SiO2)

Green Quartzite

Quartzite (primarily SiO2 with trace impurities)

Quartzite (Ferruginous)

Metamorphosed Quartz Sandstone (SiO2)

Blue Apatite

Calcium Fluorophosphate - Ca5(PO4)3F

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Quartzite

Quartzite (primarily SiO2)

Sparkling Druzy Quartz on Matrix

Silicon Dioxide (SiO2) with iron oxide inclusions

Likely greenstone (serpentinized ultramafic rock)

Serpentinite, dominated by serpentine-group minerals (chrysotile/lizardite/antigorite), possibly with chlorite or epidote

Jasper

Microcrystalline Quartz (SiO2)

Quartzite

Metamorphic quartz arenite

Quartzite

Quartzite (Metamorphic Rock)

Chert (specifically Zebra Chert/Flint)

Silicon Dioxide (SiO2)

Quartz (Yellow/Iron-stained Quartzite or Chalcedony)

Silicon Dioxide (SiO2)

Chert / Quartzite

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in Altered Host Rock

Fossilized Crab Carapace (Concretion)

Decapoda (fossil), typically preserved in calcite or siderite concretion

Nephrite Jade

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

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Silicon Dioxide (SiO2) with impurities

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chert (or Chalcedony) Nodule

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartz Sand and Gravel

Silicon dioxide (SiO2)

Travertine (Tufa)

Chemical Limestone (CaCO3)

Banded Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (SiO2)

Jasper Pebble

Microcrystalline Quartz (SiO2)

Carnelian Agate Nodule

Chalcedony (SiO2) with Iron Oxide inclusions

Chert (Field Stone)

Chert (SiO2)

Quartz Pebble (Smoky Quartz / Chalcedony)

Silicon Dioxide (SiO2)