Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Chert (Chalcedony/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Agatized Chert)

Microcrystalline Quartz (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (and/or River Pebble)

Microcrystalline silica (SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartzite (River Pebble)

Quartzite (SiO2)

Quartzite Pebble (Yellow/Cloudy Quartz)

Silicon Dioxide (SiO2) - Recrystallized Sandstone

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky and Citrine-type Quartz

Silicon Dioxide (SiO2)

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Sandstone

Arenite

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)

Quartzite

Quartzite (primarily SiO2)

Quartz (Smoky or Impure Variety)

Silicon Dioxide (SiO2)

Shale

Lutaceous sedimentary rock

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Green Aventurine (Green Quartz)

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Conglomerate

Clastic Sedimentary (Conglomerate)

Chert (Jasper-bearing)

Microcrystalline silica (SiO2) with iron oxide inclusions

Caliche (with Lichen Cover)

Calcium carbonate-cemented soil layer (CaCO3)

Botryoidal Chalcedony (Druzy Quartz)

Silicon Dioxide (SiO2)

Quartzite (River Stone)

Quartzite (SiO2)

Granite Pebble

Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)

Fossil Coral (Rugose Coral Fragment)

Rugosa (extinct order of solitary and colonial corals)

Fossilized Brachiopod

Phylum Brachiopoda (General mineral composition: Calcite/CaCO₃ or Silica/SiO₂)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide) - SiO2

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions