Industrial Byproduct (Anthropogenic Rock)

Red Garnet (Pyrope or Almandine)

Magnesium aluminum silicate (Mg3Al2(SiO4)3) or Iron aluminum silicate (Fe3Al2(SiO4)3)

Honey Calcite

Calcium Carbonate (CaCO3)

Epidote in Matrix

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

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Garnet (specifically Almandine or Pyrope)

Almandine: Fe3Al2(SiO4)3 or Pyrope: Mg3Al2(SiO4)3

Jasper and Quartz River Pebble

Silicon Dioxide (SiO2) with impurities

Garnet

Garnet Group (Silicate mineral); general formula X3Y2(SiO4)3

Black Sapphire

Corundum (Al2O3 with inclusions of hematite or ilmenite)

Satin Spar (often marketed as Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Rose Quartz

SiO2 (Silicon Dioxide)

Yellow Quartz (Citrine or Yellow Chalcedony)

Silicon Dioxide (SiO2)

Quartzite (Beach Pebble)

Quartzite (SiO2)

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Blue Dumortierite Quartz

AlAl6BSi3O18 (Dumortierite) within SiO2 (Quartz)

Smoky Quartz

SiO2 (Silicon Dioxide)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Jasper (likely Iron-stained)

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper (Green Jasper / River Jasper)

Silicon Dioxide (SiO2) with impurities

Sandstone

Arenite

Sandstone (Wonderstone)

Arenite with Liesegang rings

Sandstone (Quartzose)

Arenite (SiO2 based)

Fossiliferous Limestone

Biogenic Limestone (CaCO3)

River Stone (Chalcedony/Jasper variety)

Microcrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) - Crystalline Quartz

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains)

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Amethyst

Amethyst (Silicon Dioxide - SiO2)

Snowflake Obsidian

Obsidian with Cristobalite inclusions (70–75% SiO2)

Yellow Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

River Pebble (Likely Quartzite or Chert)

Quartzite (primarily SiO2)

Banded Agate (specifically Botswana Agate or Water-line Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Obsidian

Volcanic Glass (70-75% SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Red Jasper with Quartz Veining

Jasper (Silicon Dioxide, SiO2) with Quartz (SiO2) inclusions

Jasper (Iron-stained Quartzite/Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Snowflake Obsidian

Volcanic glass with Spherulite inclusions (SiO2)