Tektite (Natural Glass)

Browse tektite (natural glass) specimens identified by the Rock Identifier community.

Jasper (Iron-rich Chert)

Silicon Dioxide (SiO2) with impurities of Hematite or Goethite

sedimentary

Red Jasper (possibly Agatized Jasper)

Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)

sedimentary

Rose Quartz

Silicon Dioxide (SiO2) with trace impurities of Titanium, Manganese, or Iron

mineral

Amethyst

Silicon Dioxide (SiO2 with iron impurities)

mineral

Yellow Aventurine

Quartzite with inclusions (SiO2)

metamorphic

Grey Slate

Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)

metamorphic

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

sedimentary

Pebble (likely Quartzite or Chert)

Clastic Sediment, potentially composed of SiO₂ (Quartz)

Mineral, Sediment

Smoky Quartz

Quartz (SiO₂)

Mineral

Quartzite

Quartzite (SiO2)

metamorphic

Druzy Quartz Geode (likely Smokey Quartz variety)

Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.

Mineral structure/Rock

Amethyst Geode

Quartz (SiO₂) with iron impurities

Mineral/Igneous (secondary formation)

Amethyst

Quartz (SiO2) with trace iron impurities

Mineral

Sandstone (Red Arkose)

Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)

sedimentary

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Organic Material (likely a fruit or berry)

Rose Quartz

Rose Quartz (SiO2)

Mineral

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions - SiO2)

mineral

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Mineral

Halite

Halite (NaCl)

Mineral

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Mineral, Jewelry

Amethyst

SiO2 (Silicon Dioxide with Iron impurities and natural radiation influence)

mineral

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)

mineral

Peridot (Olivine)

Olivine, (Mg,Fe)2SiO4

Mineral

Topaz

Topaz (Al2SiO4(F,OH)2)

Mineral

Milky Quartz

Quartz (SiO₂)

Mineral

Chalcedony

Chalcedony (a microcrystalline variety of Quartz, SiO2)

Mineral

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

igneous

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

igneous

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Mineral

Halite

Halite (Sodium Chloride - NaCl)

Mineral

Amethyst

Quartz (SiO2) variety

Mineral

Himalayan Salt

Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.

Mineral

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Mineral

Granite (weathered pebble)

Granite (plutonic igneous rock)

Igneous

Blue Lace Agate

Chalcedony (a form of Quartz) - SiO2

Mineral

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

mineral

Banded Agate (likely Carnelian Agate or Sardonyx)

Agate is a common name for a microcrystalline variety of Quartz (SiO₂), specifically a form of Chalcedony.

Sedimentary Rock (technically a variety of Chalcedony)

Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)

Chalcedony (SiO2), Jasper (SiO2 with impurities)

Mineral (specifically a cryptocrystalline variety of Quartz)