Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Synthetic material (Not a natural rock/mineral)
Category
Non Geological
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Quartzite
Metamorphic rock (SiO2)
metamorphic
Black Obsidian
Volcanic Glass (SiO2)
igneous
Weathered granite
Granite, composed mainly of quartz, feldspar, and dark mica or amphibole
igneous
Obsidian
Obsidian (Volcanic Glass, complex silicate)
igneous
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities
mineraloid
Dark, rounded rock (possibly basalt)
Undetermined; basalt is a tentative visual identification
igneous
Quartz-rich metamorphic pebble
Milky quartz with possible feldspar and mica; likely quartzite or quartz-veined metamorphic rock
metamorphic
Quartzite Pebble
Quartzite
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (Rich in SiO2)
igneous
Polished orbicular jasper (likely ocean jasper)
Microcrystalline quartz (SiO₂), chiefly chalcedony with iron oxides and other silicate inclusions
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Likely tumbled iron-stained quartz or chalcedony
Quartz/chalcedony (SiO₂), possibly limonite-coated
mineral
Banded Sandstone (Liesegang Rings)
Sedimentary sandstone with Iron oxide precipitates
sedimentary
Navajo Sandstone
Navajo Sandstone (primarily quartz arenite)
sedimentary
River Siltstone / Mudstone Pebble
Siltstone (composed of mixed silicate and carbonate minerals)
sedimentary
Pale stone fragment (likely limestone)
Likely calcite-rich limestone (CaCO₃); the image is insufficient for a definitive identification
sedimentary
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Cupronickel (on a 1981 Mexico 20 Pesos coin)
Copper-Nickel Alloy (Cu75Ni25)
mineral
Obsidian
Amorphous volcanic glass (primarily SiO2)
igneous
Possible fossilized bone fragment
Indeterminate vertebrate bone; no taxonomic identification is possible from the image alone
fossil
Rounded sandstone cobble
Clastic sandstone, likely quartz-rich (quartz arenite or arkose)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide , SiO2)
igneous
Weathered sandstone fragment
Sandstone, chiefly quartz (SiO₂) with feldspar and iron-oxide cement
sedimentary
Ironstone concretion (possible limonite/goethite-rich piece)
Iron-oxide-rich ironstone; commonly composed of goethite (FeO(OH)) and/or limonite
sedimentary
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Rough Green Beryl (Emerald variety)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Black Tourmaline (Schorl)
Sodium Iron Aluminum Borosilicate (NaFe2+3Al6(BO3)3Si6O18(OH)4)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Red Jasper
Microcrystalline Quartz (SiO2) with Hematite impurities
sedimentary
Concrete rubble
Anthropogenic conglomerate
sedimentary
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Snowflake Obsidian
Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic