Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Category
Metamorphic Rock (For Nephrite And Some Jadeite); Mineral (For Jadeite)
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Sandstone Concretion
Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)
sedimentary
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2)
mineral
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Sandstone (Micaceous)
Clastic Sedimentary Rock (primarily SiO2 with Mica)
sedimentary
Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Extrusive Mafic Igneous)
igneous
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
mineral
Red Sandstone Pebble
SiO2 with Fe2O3 (Quartz sandstone with hematite coating)
sedimentary
Rose Quartz
Rose Quartz (SiO2)
mineral
Dalmatian jasper
Orbicular microcrystalline quartz rock, commonly rhyolitic or volcanic-feldspar matrix with black arfvedsonite/alkali-amphibole inclusions
igneous
Cloudy Quartz / Quartz Tumble
Silicon Dioxide (SiO2)
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Jasper
Jasper / Silicon Dioxide (SiO₂)
sedimentary
Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
Metamorphic
Sandstone (Ferruginous)
Arenite (with high iron oxide content)
sedimentary
Tumbled carnelian (likely chalcedony)
Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony
gemstone
Obsidian
Obsidian (Volcanic glass, primarily SiO2)
igneous
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Pegmatite (likely Granitic Pegmatite)
Pegmatite (a coarse-grained igneous rock, often with granitic composition)
igneous
Shale or Slate with Quartz Veins
Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins
Metamorphic, likely Sedimentary with Quartz veins
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Fossilized Coral
Cnidaria (Hexacorallia)
fossil
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pink Granite
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Actinolite
Ca2(Mg,Fe)5Si8O22(OH)2
mineral
Quartz (Smoky/Milky Variety)
Silicon Dioxide (SiO2)
mineral
Greenstone
Greenschist (commonly containing Chlorite, Actinolite, and Epidote)
metamorphic
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
sedimentary
Ironstone Concretion (Coprolite-like)
Goethite/Hematite Siderite Spheroid (FeCO3 or FeO(OH))
sedimentary
Rhodonite
Rhodonite (MnSiO3)
Mineral
Emerald (Tumbled Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Blue Dyed Agate Geode
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Galena
Lead Sulfide (PbS)
mineral