Quartzite with Quartz Vein
Quartzite (primarily SiO2)
metamorphic
Category
Igneous, Sedimentary, And Metamorphic
Browse igneous, sedimentary, and metamorphic specimens identified by the Rock Identifier community.
Hematite
Hematite (Fe2O3)
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Quartz Geode (Nodule)
Silicon Dioxide (SiO2)
sedimentary or igneous
Carnelian Agate
Silicon dioxide (SiO2) - variety of Chalcedony
mineral
Diabase (also known as Dolerite)
Diabase / Dolerite
igneous
Basalt with Caliche Crust
Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating
igneous
Arkosic Sandstone
Arkose
sedimentary
Granitoid (Granite/Gneiss)
Granitoid silicate rock, primarily quartz and feldspar
igneous/metamorphic
Riverstone (Quartzite/Granite Cobble)
Silicon Dioxide (SiO2) based Quartzite or Silicate-rich Granite
metamorphic or igneous
Granodiorite (Gneissic Pebble)
Granodiorite displaying minor foliation
igneous/metamorphic
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Matrix
igneous/metamorphic
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Mineral
Red Jasper
Jasper (Silicon Dioxide with Iron inclusions - SiO2)
Sedimentary/Metamorphic
Jasper (Iron-rich Chalcedony)
Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)
Sedimentary / Metamorphic
Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)
Porphyritic Basalt containing Plagioclase Feldspar phenocrysts
igneous
Blue Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Aquamarine
Beryl (Be₃Al₂Si‑₆O₁₈)
mineral
Aquamarine with Ruby Accent
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Aluminum Oxide (Al2O3)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with Fe2+ trace elements)
Mineral
Garnet (likely Pyrope or Almandine)
Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.
Mineral
Rose Quartz
Rose Quartz (SiO₂)
mineral
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
Mineral
Blue-dyed Quartz Druzy
Silicon Dioxide (SiO2) with artificial pigment
mineral
Yellow Chalcedony (Carnelian/Yellow Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Amethyst
Amethyst (SiO2 - Silicon Dioxide with iron impurities)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Carnelian Agate
Carnelian (Silicon Dioxide: SiO2) with iron oxide impurities
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Dendritic Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Aquamarine (Beryl)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Grey Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
Sandstone (Red)
Arenite (primarily Quartz, SiO2, with Iron Oxide cement)
sedimentary
Yellow Quartz Pebble (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Botryoidal/Orbicular Agate)
Silicon Dioxide (SiO2)
Mineral (variety of Chalcedony/Quartz)