Metamorphic Rock (Variety Of Quartz)

Quartz Vein in Host Rock (Gabbro or Basalt)

Silicon Dioxide (SiO2) with Mafic Silicates

Yellow Calcite

Calcium Carbonate (CaCO3)

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Quartzite

Quartzite (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)

Chert (Jasper/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Pink Quartzite

Quartzite (SiO2 with iron oxide inclusions)

Feldspar (specifically Orthoclase)

Potassium aluminum silicate (KAlSi3O8)

Ferruginous Quartz on Ironstone

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Smoky Quartz

Silicon dioxide (SiO2)

Conglomerate

Conglomerate (Sedimentary Clastic Rock)

Granitoid (Granite/Gneiss mix)

Granite or Granitic Gneiss (Silicon dioxide SiO2 with Al, K, Na silicates)

Giallo Ornamental Granite

Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Unakite (Epidotized Granite)

Epidote-Feldspar-Quartz Rock

Greenstone / Quartzite Pebble

Metamorphosed Quartz-rich Rock

Quartz Geode

Silicon Dioxide (SiO2)

Tiger's Eye (Golden and Blue Pietersite mix)

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Gneiss (Metamorphic Rock)

Gneiss

Concretionary Sandstone

Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)

Quartzite River Rock

Quartzite (primarily SiO2)

Quartzite

Quartzite (Primary mineral: Silicon Dioxide, SiO2)

Jasper (Red/Brown Variety)

Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)

Chert (White/Gray variety)

Chert (SiO2)

Unakite (Epidote-Rich Granite)

Unakite (Granite consisting of Orthoclase, Quartz, and Epidote)

Chert (Nodular)

Chert (Microcrystalline Quartz, SiO2)

Jasper

Silicon dioxide (SiO2)

Chert (Septarian or Nodular variety)

Microcrystalline Quartz (SiO2)

Pink Quartzite

Quartzite (mainly SiO2 with iron oxide impurities)

Unakite

Unakite (Altered Granite)

Schist

Mica Schist

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Quartzite Pebble

Quartzite (predominantly Silicon Dioxide - SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Sandstone (Stream-rounded)

Arenite (SiO2 based)

Amethyst (Quartz variety)

Amethyst [Silicon Dioxide (SiO2)]

Banded Onyx (Calcite Marble)

Calcite (CaCO3) - Trap-rock or Cave Onyx

Quartz / Vein Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Blue Tiger's Eye (Hawk's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2)

Gneiss

High-grade metamorphic rock (Gneiss)