Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
Chalcedony (Moonstone variant or White Agate)
Silicon Dioxide (SiO₂)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Diorite (River Pebble)
Diorite
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Gossan with Copper Carbonate (Chrysocolla/Malachite)
Ferruginous Oxide (Gossan) with Cu2CO3(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)
Mineral/Sedimentary Interface
Amethyst
Amethyst (Purple Quartz); formula: SiO2 (Silicon Dioxide)
mineral
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Sandstone
Arenite/Quartz Arenite
sedimentary
Banded Agate (specifically Carnelian Agate)
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt
igneous
Amber Inlay Jewelry
Fossilized Resin (C10H16O)
Organic Gemstone (Biogenic)
Massive Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
River Quartz (Milky and Smoky mix)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Quartz (Silicon Dioxide - SiO2)
mineral
Rough Corundum (likely Sapphire/Zircon-bearing)
Aluminium Oxide (Al2O3)
mineral
Amber
Succinite (C10H16O)
mineral
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Fluorite (likely Green Fluorite variant)
Calcium Fluoride (CaF2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 dominant staining)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chrysocolla in Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Botryoidal Goethite on Quartz
Goethite (α-Fe3+O(OH)) on Quartz (SiO2)
mineral
Orbicular Rhyolite (Rainforest Jasper)
Rhyolite containing Spherulites (SiO2 with impurities)
igneous
Snowflake Obsidian
Volcanic glass containing Spherulitic Cristobalite (SiO2)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Tiger's Eye (dark/grey variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)
igneous
Granite Pebble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Granite (composed primarily of Quartz SiO2 and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8))
igneous
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)
metamorphic
Banded Agate (Lace Agate)
Agate (Variety of Cryptocrystalline Quartz), SiO2
mineral
Quartz (likely milky/rose quartz variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral