Sedimentary Or Igneous (Host Environment)

Greenschist (Greenstone)

Chlorite Schist / Greenschist Facies Rock

Chert Nodules / Flint

Crystalline Silica (SiO2)

Sandstone with Manganese Dendrites

Arenite (mostly SiO2) with Manganese Oxide inclusions (MnO2)

Iron Ore (Hematite/Magnetite mixture)

Ferrous Oxide (Fe2O3 / Fe3O4)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz-veined Basalt

Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein

Rough Quartz in Pegmatite Matrix

Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite

Chert (Nodule)

Silicon Dioxide (SiO2)

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) Infilling

Fossiliferous Chert (with Fossil Shells)

Silicon Dioxide (SiO2) with biogenic inclusions

Boxwork Siderite or Sepatarian Nodule Weathering

Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milk Quartz

Silicon Dioxide (SiO2)

Sapphire

Corundum (Al2O3)

Blue Sapphire

Corundum (Al2O3)

Banded Agate Geode (with Microcrystalline Quartz)

Silicon Dioxide (SiO2) - variety Chalcedony/Agate

Emerald in Matrix

Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6

Agate (specifically Carnelian or Honey Agate)

Silicon Dioxide (SiO2)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxides

Carnelian (a variety of Chalcedony)

SiO2 (Silicon Dioxide with Iron Oxide impurities)

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Jasper with Agate and Quartz Inclusions

Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate

Chert (with Limestone matrix)

Microcrystalline Quartz (SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Granitic Pegmatite

Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)

Chert (Jasper/Agate Peat)

Microcrystalline Quartz (SiO2)

Copper Ore (likely Malachite or Chrysocolla staining)

Copper Secondary Mineral (e.g., Cu2CO3(OH)2)

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Diamond in Kimberlite

Kimberlite host rock with C (Carbon) inclusion

Chalcedony with Druzy Quartz

Silicon Dioxide (SiO2)

Sandstone (Quartzite Pebble)

Arenite (SiO2)

Rough Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Calcite Geode

Calcium Carbonate (CaCO3)

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Druzy Quartz on Matrix (likely Limestone or Sandstone)

Silicon Dioxide (SiO2) with various trace impurities

Granite Water-Worn Pebble

Phaneritic intrusive igneous rock (Felsic)

Quartz Vein in Host Rock (Gabbro or Basalt)

Silicon Dioxide (SiO2) with Mafic Silicates

Quartz (Milky/Crystalline fragment)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Granite Pebble

Felsic Igneous Rock (Granitic composition)