Fossilized Coral (Rugose or Tabulate) or Stromatolite
Phylum Cnidaria / Stromatolithus
fossil
Category
Man Made Object (Metalwork)
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Amber (Cherry or Red variety)
Succinite (with various trace amounts of organic compounds)
Organic Gemstone (not a rock)
Red Mudstone (Siltstone)
Lutite (primarily Quartz and Clay minerals with Hematite)
sedimentary
Granite Pebble
Granite
igneous
Tumbled milky quartz (probable)
Quartz, silicon dioxide (SiO₂)
mineral
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Amber
Succinite (with a generalized formula of C10H16O)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Plagioclase Feldspar (specifically Albite/Oligoclase)
(Na,Ca)(Si,Al)4O8
mineral
Quartz-rich breccia or altered granite fragment
Polymineralic quartz–feldspar rock, likely hydrothermally altered granite/pegmatite
igneous
Magnetite-rich iron ore (probable magnetite schist)
Magnetite (Fe₃O₄) in a foliated metamorphic matrix, possibly magnetite–biotite schist
metamorphic
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled milky quartz
Quartz (SiO₂), likely massive milky quartz
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Imperial Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions
Sedimentary
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2), a variety of Actinolite-Tremolite
metamorphic
Quartz geode (likely amethyst-bearing geode)
Microcrystalline quartz and drusy quartz; SiO₂, with possible iron-stained or amethyst quartz
mineral
Granite
Granite (a common rock type, not a single mineral species)
Igneous
Quartz
Quartz (SiO₂)
Mineral
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
White Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Chert (specifically Yellow or River Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite Pebble (River Rock)
Phaneritic Felsic Igneous Rock
igneous
Magnetite or Magnetic Iron Ore
Magnetite (Fe3O4)
mineral
Granite
Granite
igneous
Granite
Intrusive Igneous Rock
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Pumice
Volcanic glass / Pumiceous rock
igneous
Howlite (tumbled stone)
Howlite, Ca₂B₅SiO₉(OH)₅
mineral
Crinoid Marble
Crinoidal Limestone/Marble
fossil
Chert (Flint Pebble)
Silicon Dioxide (SiO2)
sedimentary
Granodiorite
Granodiorite (intermediate plutonic rock)
igneous
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Chlorite inclusion
Silicon Dioxide (SiO2) with Chlorite group inclusions
mineral
Amber
Succinite (Formula: C10H16O)
mineral
Tumbled green-and-white stone, likely serpentine
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and carbonate veins
metamorphic