Man Made Glass (Often Grouped With Minerals In Lapidary)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Chert (often called Flint or Jasper if reddish)

Microcrystalline Quartz (SiO2)

Quartz (Pink/Orange Variety)

Silicon Dioxide (SiO2)

Fluorite (Yellow and Multi-color)

Calcium Fluoride (CaF2)

Garnet

Garnet Group (Silicate Minerals), formula varies e.g., Alm: Fe3Al2(SiO4)3

Chert (with Limonite staining)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Smoky Quartz occurring with Feldspar

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Chert (Pink and Yellow Chert)

Microcrystalline Quartz (SiO2)

Jasper

Silicon Dioxide (SiO2) with impurities

Granite

Phaneritic Plutonic Rock (High Silica content)

Diabase (Greenstone Pebble)

Diabase or Dolerite

Jasper with Agate and Quartz Inclusions

Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Amethyst (Chevron Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Quartz (specifically Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Oxides

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Botryoidal Chalcedony Geode

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Chert (often found as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert / Chalcedony

Silicon Dioxide (SiO2)

Lepidolite

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

Blue Calcite

Calcium Carbonate (CaCO3)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Garden Quartz

Silicon Dioxide (SiO2) with various inclusions (Lodolite)

Blue Chalcedony Geode (with Quartz Druzy)

Silicon Dioxide (SiO2) - Microcrystalline variety of Quartz

Quartz

Silicon Dioxide (SiO2)

Septarian Nodule

Septarian Concretion (CaCO3 with Siderite/Limonite streaks)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)

Chert (Grey Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz (Chert/Chunky Chalcedony)

Silicon Dioxide (SiO2)

Chert (specifically Flint)

Microcrystalline Quartz (SiO2)

Garnet (Almandine or Spessartine likely)

Garnet Group Minerals (e.g., Almandine Fe3Al2(SiO4)3, Pyrope Mg3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3)

Sandstone

Arenite (SiO2 based)

Moonstone

Adularia (orthoclase) or Albite (plagioclase), a potassium aluminum silicate of the feldspar group

Clear Quartz

Silicon Dioxide (SiO2)

Serpentine

Serpentine group ((Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Puddingstone

Conglomerate