Citrine
Silicon Dioxide (SiO2) with iron impurities
Category
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
Citrine
Silicon Dioxide (SiO2) with iron impurities
Milky Quartz (Water-Worn Pebble)
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
Calcite
Calcium Carbonate (CaCO3)
Milky Quartz
Quartz (Silica / Silicon Dioxide, SiO2)
Agate
Banded Chalcedony (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Pyrite
Iron Disulfide (FeS2)
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Rhodochrosite
Manganese carbonate (MnCO3)
Orange Calcite
Calcium Carbonate (CaCO3)
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
Quartzite
Quartzite (SiO2)
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
Quartzite River Stone
Quartzite (primarily SiO2)
Quartzite
Quartzite (Silicon Dioxide, SiO2)
Quartz Geode
Silicon Dioxide (SiO2)
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Quartzite Pebble
Meta-quartzite
Quartzite Pebble
Quartzite (SiO2)
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
Ferruginous Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
Quartz (Milky/Vein Quartz)
Silicon Dioxide (SiO2)
Mixed Quartz Bracelet (Rose Quartz and Larimar-colored beads)
Silicon Dioxide (SiO2) with various inclusions
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Clear Quartz Crystal
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Magnetic Hematite (Man-made)
Iron Oxide (Fe2O3) with Barium-Strontium Ferrite
Hematite
Iron(III) oxide (Fe2O3)
White Jade / White Chalcedony
Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
Quartz (Milky or Clear Quartz fragment)
Silicon Dioxide (SiO2)
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
Gneiss (specifically a Banded Gneiss pebble)
Gneiss (High-grade Regional Metamorphic Rock)