Opalite
Man-made Glass (Synthetic Opalized Glass)
gemstone
Category
Not A Rock (Animated Character)
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Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)
mineral
Unakite
Epidote-Feldspar rock (specifically, a variety of granite)
Metamorphic rock
Amber
Succinite (specifically for Baltic amber); Fossilized Tree Resin (C10H16O)
Organic Mineraloid
African Turquoise (Jasper)
Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)
Rock
Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)
Jasper, microcrystalline quartz (SiO₂)
Sedimentary Rock
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Black Obsidian with white veins
Volcanic Glass (70–75% SiO2)
igneous
Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color
Silicon Dioxide (SiO2), a variety of Chalcedony
Sedimentary Rock
Agate (Dyed) or composite stone
SiO2
mineral
Shungite
Carbonaceous rock (primarily amorphous carbon)
Mineraloid
Schist
Mica Schist
metamorphic
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Mineral
Milk Quartz (or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (SiO2) with trace iron impurities
Mineral
K2 Azurite Granite / K2 Stone
Granite (igneous rock) with Azurite inclusions (mineral)
igneous
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Iron Meteorite
Iron-nickel alloy (primarily kamacite and taenite)
Meteorite (extraterrestrial material)
Tektite (likely Australite)
Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)
Mineral (specifically a mineraloid)
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Jade
There are two distinct minerals commonly known as Jade: Jadeite (NaAlSi2O6) and Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2). Based on the appearance, these spheres are likely Nephrite.
Mineral
Amethyst
Amethyst (variety of Quartz, SiO2)
mineral
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide)
Mineral
Mica (Muscovite)
Muscovite, KAl2(AlSi3O10)(OH)2
Mineral
River/Stream Pebble
Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)
Mineral, specifically a rock fragment
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Quartz (in matrix)
Quartz (SiO₂)
mineral
Pyrite
Pyrite (FeS2)
Mineral
Rose Quartz
Rose Quartz (SiO₂)
mineral
Diopside (likely Chromian Diopside)
Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.
mineral
Jasper (var. Ocean or Polychrome Jasper)
Silicon Dioxide (SiO2) with iron and mineral inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz (Tumbled)
Quartz (Silicon Dioxide, SiO2)
mineral
Obsidian
Volcanic Glass (SiO2, usually >70% silica content)
Igneous