Mineral Within Sedimentary Rock

Chert

Chert (Microcrystalline Silica, SiO2)

Jasper / Chert (River Pebble)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone (Painted)

Arenite (primarily SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within metamorphic/igneous matrix

Epidote in Quartz

Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Coquina

Bioclastic Limestone (Calcium Carbonate, CaCO3)

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Quartz (vein quartz)

SiO2 (Silicon Dioxide)

Amethyst

Amethyst (Silicon Dioxide with Iron impurities, SiO2)

Crazy Lace Agate

Agate (Cryptocrystalline Quartz), Silicon Dioxide (SiO2)

Bituminous Coal

Bituminous coal (Organic Sedimentary Rock)

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Chalcedony with Matrix

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate

Chert (Jasper/Flint variation)

Chert (SiO2)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Chert (Jasper/Ironstone variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone with Quartz Vein

Arenite with SiO2 intrusion

Emerald In Matrix (Quartz/Calcite)

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Quartz Geode

Silicon Dioxide (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Chert (often called Jasper or River Rock)

Chert (SiO2)

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Chert (Red/Brown Variety)

Microcrystalline quartz (SiO2)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Dendritic Agate (or Dendritic Opal)

SiO2 (for Agate), SiO2·nH2O (for Opal)

Schist

N/A (a rock type, not a mineral formula)

Chert (White Chert/Flint)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Chert (Nodule)

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Yellow/Tan)

Microcrystalline Quartz (SiO2)

Chert (Pink Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Smoky Quartz (with possible Feldspar inclusions)

Silicon Dioxide (SiO2)

Amethyst (Tumbled)

Purple Quartz (SiO2 with iron impurities and irradiation)

Vesicular Basalt (Iron-Stained)

Mafic Volcanic Rock (Basalt)

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Chert (variously identified as Flint)

Microcrystalline Quartz (SiO2)