Mineral In Igneous Rock

Garnet

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

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Dalmatian Jasper

Peralkaline Quartz Feldspar Porphyry

Dalmatian Stone

Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock

Note: Item is not a geological specimen

n/a

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky or Citrine-tinted)

Silicon Dioxide (SiO2)

Sandstone with Iron Banding

Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Granite (Weathered/Oxidized)

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

Pink Granite

Granite (Phaneritic intrusive igneous rock dominated by Quartz and K-Feldspar)

Basalt River Pebble

Extrusive mafic igneous rock; primarily composed of Plagioclase Feldspar and Pyroxene

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Ruby

Corundum (Al2O3)

Pyrite

Iron Sulfide (FeS2)

Epidote

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz (Ferruginous variety)

Silicon Dioxide (SiO2)

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite treated with acid

Indigo Gabbro (also known as Mystic Merlinite)

Gabbro (composed of Plagioclase Feldspar, Pyroxene, and minor Magnetite/Ilmenite)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granite

Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)

Graphite

Graphite (Carbon, C)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Vuggy Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Granite

Granite (Felsic intrusive igneous rock)

Granite

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

Pyrite

Iron Sulfide (FeS2)

Banded River Rock / Gneiss (highly weathered)

Gneiss

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Fluorite

Calcium Fluoride (CaF2)

Green Aventurine and Clear Quartz

Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)