Industrial Byproduct (Anthropogenic Rock)

Yellow Chert or Jasper

Microcrystalline Quartz (SiO2)

River Pebble (Quartz/Jasper)

Silicon Dioxide (SiO2)

Fossiliferous Chert with Brachiopod Impression

Chert (SiO2) containing Brachiopoda fossil remains

Sandstone

Clastic sedimentary rock (primarily SiO2)

Granite

Granite (Felsic Plutonic Rock)

Coquina / Fossiliferous Limestone

Fossiliferous Limestone (CaCO3)

Black Sapphire

Corundum (Al2O3 with iron and titanium impurities)

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

White Marble (Industrial/Architectural)

Recrystallized Calcite (CaCO3)

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 oxides)

Rough Diamond

Pure Carbon (C)

Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Vesicular Basalt with Epidote

Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Shale

Fissile Siliciclastic Sedimentary Rock

Basalt with Quartz/Quartzite Veins

Aphanitic Mafic Volcanic Rock with Siliceous Infillings

Quartz-veined Mudstone or Argillite

SiO2 (Quartz) in Siltstone/Mudstone matrix

Milky Quartz

Quartz (Silica / Silicon Dioxide), SiO2

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Crushed Stone / Gravel

Aggregatus saxum (variable mineral composition)

Sandstone

Arenite (primarily SiO2)

Quartzite River Pebbles

Quartzite (primarily SiO2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Granodiorite or Diorite

Granodiorite / Diorite

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Quartz with inclusions (likely Chlorite or Hornblende) and country rock

SiO2 (Quartz) with associated ferromagnesian minerals

River Pebble (Quartzite or Chert)

Silicon Dioxide (SiO2)

Basalt with Granite Inclusions (Xenoliths)

Mafic igneous rock (Basalt) with Sialic minerals

Sandstone

Clastic sedimentary rock (primarily SiO2)

Basalt

Basalt (Aphanitic-fine grained mafic igneous rock)

Quartzite

Quartzite (primarily SiO2)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Chakra Tumbled Stone Set

Various (including Amethyst [SiO2], Sodalite [Na8(Al6Si6O24)Cl2], Green Aventurine [SiO2], Red Jasper [SiO2], etc.)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Quartz River Pebble with Algae

Silicon Dioxide (SiO2) with organic biofilm

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Orange Calcite

Calcium Carbonate (CaCO3)

Blue Sapphire (Raw/Tumbled Corundum)

Corundum (Aluminum Oxide, Al2O3 with Fe/Ti traces)

Green Jasper

Silicon Dioxide (SiO2)

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Jasper containing Agate (Jaspagate)

Silicon Dioxide (SiO2)

Bumblebee Jasper

Fibrous Calcite with Arsenic and Sulfur inclusions

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)