Man Made Material (Metal)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Obsidian

Obsidian (Volcanic Glass)

River Cobble (Basaltic/Andesitic)

Mafic Igneous Porphyritic Rock

Ruby (Raw/Rough)

Corundum (Al2O3 with Chromium trace)

Pink Quartz (Rose Quartz)

Silicon Dioxide (SiO2)

Epidote

Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Crushed Granite Gravel

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase Feldspar)

Serpentinite

Serpentinite (composed mainly of Group: Serpentine; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Chert (Yellow/Brown Jasper)

Silicon Dioxide (SiO2)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Rose Quartz

Silicon Dioxide (SiO2)

Chert / Jasper / Agate (Chalcedony Group)

Microcrystalline Quartz (SiO2)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Nephrite Jade (River Bed Pebble)

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (SiO2)

Golden Healer Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Flint)

Microcrystalline Silica (SiO2)

Malachite

Copper(II) carbonate hydroxide [Cu2CO3(OH)2]

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Tektite (Indochinite)

Tektite (High-silica natural glass, primarily SiO2 with Al2O3)

Chert (often called Flint)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Banded Chert / Flint

Silicon dioxide (SiO2)

Chert (variations include Flint)

Chert (Silicon Dioxide, SiO2)

Chert (specifically Blue or Grey Chert/Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (specifically Yellow Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Coquina

Coquina (Bioclastic Limestone)

Quartzite

Quartzite (primarily SiO2)

Chert (specifically Flint or Common Opal/Chalcedony mix)

Microcrystalline Quartz (SiO2)

Blue Lace Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (often called Flint when dark)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Amber Flint (Chert)

Cryptocrystalline Quartz (Silicon Dioxide, SiO2)

Black Sapphire (Basaltic Blue Sapphire)

Corundum (Al2O3)

Botryoidal Malachite

Malachite - Cu2CO3(OH)2

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (specifically Black Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Blue-Gray Chert)

Microcrystalline quartz (SiO2)