Granite or Granitic Gneiss River Rock
Granite / Gneiss
Igneous or Metamorphic
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
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Quartz (Milky or Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Iron-Stained Quartzite
Recrystallized Quartz (SiO2) with Ferruginous Oxides
metamorphic
Pink Granite
Pink Granite (Felsic Intrusive Igneous Rock)
igneous
Diorite (River Pebble)
Phaneritic Intermediate Igneous Rock (Diorite)
igneous
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Yellow Quartzite (or Yellow Chalcedony Pebble)
Silicon Dioxide (SiO2)
metamorphic
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Limonite/Hematite over Sandstone)
sedimentary
Agate (specifically Lace Agate or Banded Agate)
Silicon Dioxide (SiO2)
mineral
Pink Granite (Water-worn Cobble)
Phaneritic Felsic Intrusive Igneous Rock
igneous
Quartz Geode (partially formed/chalcedony with iron staining)
Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides
Mineral/Sedimentary Rock Feature
Granite Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Iron Meteorite
Iron-Nickel Meteorite (Siderite)
meteorite
Pyritic Gneiss
Metamorphic Gneiss with Pyrite inclusions
metamorphic
Smoky Quartz (Herkimer-style)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Crystalline Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Gravel)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Chert (Iron-stained)
Microcrystalline quartz (SiO2)
sedimentary
Quartz (Milky or Yellowish)
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Amygdaloidal Basalt
Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)
igneous
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Limestone (Weathered)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Azurite-Malachite (often a mixed specimen)
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.
Mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Quartzite Cobble / Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Basalt (River Stone)
Extrusive mafic igneous rock
igneous
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary/mineral
Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)
Phylum Echinodermata, Class Echinoidea
sedimentary
Chert (variant Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert with Quartz Veining
Silicon Dioxide (SiO2)
sedimentary
Carnelian Agate / Iron-Stained Quartz
SiO2
Mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Granite (weathered/river-tumbled)
Granite (Plutonic Igneous Rock)
Igneous Rock
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Sedimentary / Mineral (Silica)
Quartz Geode
Silicon Dioxide (SiO2) within a secondary sedimentary structure
sedimentary