Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Category
Mineral_rock
Browse mineral_rock specimens identified by the Rock Identifier community.
Quartz in Matrix (possibly Basalt or Siltstone host)
Silicon Dioxide (SiO2) in Host Rock
mineral
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
River Rock (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Basalt with Granite Inclusions (Xenoliths)
Mafic igneous rock (Basalt) with Sialic minerals
igneous
Vesicular Basalt with Epidote
Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Diorite
Phaneritic intermediate plutonic rock
Igneous
Basalt with Scoria
Amygdaloidal Basalt / Vesicular Basalt
igneous
Unakite
Epidotized Granite
metamorphic
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Sandstone (lithic/greywacke variant)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Gneiss
Gneissic Metamorphic Rock
metamorphic
Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead)
Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)
Mineral for Fluorite; Mineral/Rock for Jadeite (as it's often a rock composed primarily of jadeite mineral)
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Granite Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Milky Quartz (Quartz Vein)
Silicon Dioxide (SiO2)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Conglomerate
Conglomerate rock
sedimentary
Granite
Granite (a plutonic rock)
Igneous
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic