Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Category
Sedimentary Or Igneous
Browse sedimentary or igneous specimens identified by the Rock Identifier community.
Basalt
Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Basalt with Caliche
Extrusive Mafic Igneous Rock with Secondary Carbonate Crust
igneous
Pink Granite
Phaneritic intrusive igneous rock (K-feldspar rich)
igneous
Granite with Orthoclase and Hematite Staining
Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)
igneous
Feldspathic Granite (likely Syenite or Granite Pegmatite)
Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)
igneous
Basalt with Iron Oxidation
Extrusive Mafic Igneous Rock (composed of Plagioclase and Pyroxene)
igneous
Granite (Pink/Red Granite)
Phaneritic Igneous Rock (primarily SiO2, KAlSi3O8, NaAlSi3O8)
igneous
Pink Granite
Phaneritic Igneous Rock (high K-feldspar content)
igneous
Pumice
Vesicular Rhyolite (highly vesicular igneous volcanic rock)
igneous
Granite
Plutonic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Obsidian
Volcanic glass (SiO2-rich extrusive igneous rock)
igneous
Basalt
Extrusive Igneous Basalt (contains Plagioclase Feldspar and Pyroxene)
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granite (specifically Brown Granite Countertop)
Phaneritic Felsic Igneous Rock (Granite-Gabbro series)
igneous
Porphyry
Porphyritic Igneous Rock (likely Porphyritic Andesite or Basalt)
igneous
Sandstone
Arenite (SiO2 dominant)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Chert (specifically Red Chert/Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (variations like Agate or Jasper)
Chalcedony (SiO₂ - microcrystalline quartz)
Mineral
Sandstone (likely Calcareous or Quartz-rich)
Arenite (SiO2 based typically)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Thunderegg (Agate-filled Geode Node)
Silicon dioxide (SiO2) with various inclusions
sedimentary/igneous association
River Cobbles (Basalt, Quartzite, and Sandstone mix)
Fluvial detritus (primarily SiO2, Plagioclase, and Pyroxene mix)
Mixed: Igneous and Sedimentary
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Sandstone (likely Siltstone)
Arenite or Siltstone (high SiO2 content)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Basalt with Pahoehoe flow texture
Vesicular Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt (with possible iron oxide staining)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Granite
Granite (silica-rich intrusive igneous rock)
igneous
Pink Granite
Granite (Phaneritic igneous rock rich in Orthoclase)
igneous
Granite
Granite (Phaneritic Quartz-Feldspar Igneous Rock)
igneous
Granite (Pink/Red)
Phaneritic Igneous Rock (Rich in K-Feldspar)
igneous