Synthetic Glass (Often Categorized As A Simulated Mineral)

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite mica)

Aventurine (Green Quartz)

Quartz with Fuchsite inclusions (SiO2 with K(Al,Cr)2(AlSi3O10)(OH)2)

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Chert (SiO2)

Milky Quartz

Silicon dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Obsidian

Amorphous volcanic glass (primarily SiO2)

Chert (Nodular Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Brown Chert)

Silicon Dioxide (SiO2)

Banded Chert

Sedimentary Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2) with iron oxide impurities

Chert / Flint

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Granite

Phaneritic Felsic Igneous Rock

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) / Microcrystalline Quartz

Quartzite

Quartzite (SiO2)

Jasper (yellow/cream variety)

SiO₂ (Cryptocrystalline Quartz)

Amethyst (Rose-tinted variation)

Silicon Dioxide (SiO2) with trace iron impurities

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Rough Emerald

Beryl (Be3Al2(SiO3)6 with Chromium/Vanadium impurities)

Limonite Concretion (Ironstone)

Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)

Amygdaloidal Basalt

Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)

Jasper and Quartz conglomerate (River Rock)

Silicon Dioxide (SiO2) - Chalcedony and Quartz variety

Chert (containing fossil leaf impression)

Microcrystalline silicon dioxide (SiO2)

Chert (Yellow/Tan Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (specifically Clear Quartz with iron/hematite staining)

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Chert Breccia

Brecciated Chert (SiO2)

Chert (specifically Flint or Common Opal/Chalcedony mix)

Microcrystalline Quartz (SiO2)

Native Copper

Native Copper (Cu)

Quartzite

Quartzite (primarily SiO2)

Quartzite pebble

Quartzite (SiO2)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Opaline Silica (SiO2)

Chert (Jasper variation)

Silicon Dioxide (SiO2)

Jasper (Chert)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)