Sandstone
Arenite (SiO2 principal component)
sedimentary
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Amethyst
Amethyst (SiO2 with Iron impurities)
mineral
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Sandstone
Arenite (CaCO3/SiO2 cemented quartz)
sedimentary
Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Metallic sulfide ore, likely pyrite-bearing rock
Pyrite (FeS₂), possibly with chalcopyrite and quartz/host rock
mineral
Diamond (Faceted)
Carbon (C)
mineral
Diamond
Diamond (pure carbon, C)
mineral
Banded Chalcedony (Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Goldstone
Aventurine Glass (SiO2 + Cu small inclusions)
man-made glass mineral simulant
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Yellow Quartz (Citrine Quartz or Yellow Chalcedony)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Ferruginous Sandstone
sedimentary
Quartzite Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Granite River Stone
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O
igneous
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Rough Diamond
Diamond (pure Carbon, C)
mineral
Limonite / Goethite Ironstone
FeO(OH)·nH2O (Hydrous iron oxide)
mineral
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Dalmatian jasper
Orbicular microcrystalline quartz rock, commonly rhyolitic or volcanic-feldspar matrix with black arfvedsonite/alkali-amphibole inclusions
igneous
Likely slag or metallic industrial byproduct
Unidentified iron-rich ferrous slag; possibly magnetite-bearing slag
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chert (Commonly known as Flint/Jasper)
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Polished blue stone, likely sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed jasper or lapis lazuli
mineral
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Sandstone
Ferruginous Sandstone
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Sandstone
Arenite
sedimentary
Smoky Quartz on Matrix
Silicon Dioxide (SiO2) with trace impurities and aluminum inclusions
mineral
Dyed Fuchsia Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Granite (Weathered)
Plutonic Igneous Rock (Granitic)
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Chert (and/or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Felsic intrusive igneous rock (Granite)
igneous
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Quartz-bearing metamorphic rock, possibly epidote/quartzite
Quartz-rich rock with possible epidote and feldspar; exact identification requires testing
metamorphic
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Emerald in Matrix
Beryllium Aluminum Silicate (Be3Al2(SiO3)6) with Chromium/Vanadium
gemstone