Granite (specifically Pink or Red Granite)
Phaneritic Felsic Igneous Rock (Granite)
igneous
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
Granite
Granite (composed primarily of Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)
igneous
Basalt
Basalt (composition mainly of Plagioclase feldspar, Pyroxene, and Olivine)
igneous
Diamond (in Jewelry Setting)
Carbon (C) - Isometric-Hexoctahedral
mineral
Gold Nugget
Native Gold (Au)
mineral
Granite (specifically Pink Granite)
Phaneritic Plutonic Rock (High Potassium Feldspar Granite)
igneous
Native Silver
Silver (elemental Ag)
mineral
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Granite (White Granite variant)
Phaneritic Plutonic Rock (High-silica Felsic)
igneous
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Gold Flake / Placer Gold
Native Gold (Au)
mineral
White Quartz (Milky Quartz Mushroom)
Silicon Dioxide (SiO2)
mineral
Yooperlite (Sodalite-rich Syenite)
Sodalite-bearing Syenite
igneous
Iron Slag
Anthropogenic pyrometallurgical residue
industrial byproduct
Agate (or Banded Agate)
Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)
Mineral, specifically a Cryptocrystalline Quartz variety
Banded Rhyolite (likely Green Jasper/Agate variety)
Silicon Dioxide (SiO2) with mineral inclusions
igneous
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Peridot (Olivine)
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
N/A - Image is non-geological
Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)
Synthetic material (Plastic/Polymer)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Apache Tear
Obsidian (Volcanic Glass), SiO2 + MgO, Fe3O4
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2 + Manganese/Iron oxides)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Basalt with Olivine Phenocrysts
Porphyritic Basalt (containing Mg2SiO4 - Fe2SiO4)
igneous
Rose Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Black Pearl (Tahitian Pearl)
Aragonite / Calcite (CaCO3) with Conchiolin
mineral
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide)
mineral
Gold Nugget
Native Gold (Au)
mineral
Diamond (or Cubic Zirconia)
Crystallized Carbon (C) for Diamond; Zirconium Dioxide (ZrO2) for CZ
mineral
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Gold and Cubic Zirconia (San Judas Tadeo Pendant)
Native Gold (Au) with Synthetic Cubic Zirconia (ZrO2)
mineral
Chondrite Meteorite
Ordinary Chondrite (OC)
igneous
Limonite/Goethite Nodule
Iron Oxyhydroxide (primarily FeO(OH)·nH2O)
mineral
Diamond (set in a gold ring)
Carbon (C) - Adamantine cubic carbon
mineral
Quartz Crystal Point
Silicon Dioxide (SiO2)
mineral
Firewood (Wood Log)
Lignum (Plant tissue composed of cellulose and lignin)
Organic (Non-geological)