Sedimentary (Chemically Precipitated) Or Metamorphic

Chert (Chert / Flint)

Silicon Dioxide (SiO2)

Chert (White Flint)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (Shell Fragment)

Biogenic Limestone (Calcium Carbonate / CaCO3)

Chert (Jasper variation)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Almandine Garnet in Matrix

Almandine, Fe3Al2(SiO4)3

Quartz (Gravel)

Silicon Dioxide (SiO2)

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with Elemental Gold (Au)

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Gold

Native Gold (Au)

Quartz (specifically Milky or Clear Chunk)

Silicon Dioxide (SiO2)

Gold and Cubic Zirconia (San Judas Tadeo Pendant)

Native Gold (Au) with Synthetic Cubic Zirconia (ZrO2)

Gold

Native Gold (Au)

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color

Silicon Dioxide (SiO2), a variety of Chalcedony

Chert (specifically Yellow Jasper variety)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Black Chert / Flint)

Silicon Dioxide (SiO2)

Chert

Chert (Silicon Dioxide, SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Chert (Green variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Pyrite (FeS2)

Quartzite (river pebble) and Gabbro (crushed rock)

Quartzite (metamorphosed Quartz Sandstone, SiO2) and Gabbro (Plagioclase-Clinopyroxene rock)

Gneiss

Gneissic Metamorphic Rock

Gneiss (specifically Granitic Gneiss)

Gneissic Metamorphic Rock

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Hematite

Hematite (Α-Fe2O3)

Mixed Mineral and Fossil Collection

Multi-specimen assemblage (SiO2, CaCO3, FeS2, etc.)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Mineral

Silicon Dioxide (SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with fuchsite inclusions)

Chert (including Flint and Jasper variants)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pyritized Ammonite

Ammonitida (replaced by Iron Disulfide, FeS2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Granitic Gneiss

Gneiss (Metamorphic Rock)

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides