Petrified Wood
Silicified Wood (SiO2)
fossil
Category
Man Made Object (Ring)
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Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Pumice (or Volcanic Scoria)
Vesicular Rhyolite or Vesicular Basalt
igneous
Petrified Wood
Silicified wood (principally SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Unable to Identify (Image Obscured)
Indeterminate
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Optical Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Diamond
Carbon (C)
gemstone
Jasper (Green Jasper / Chert)
Silicon Dioxide (SiO2 with inclusions)
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO2) colored by iron oxide
mineral
Ruby in Fuchsite (often confused with Ruby in Zoisite)
Corundum (Al2O3) in Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2)
metamorphic
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
Weathered limestone pebble
Limestone, chiefly calcite (CaCO₃)
sedimentary
Oceanside Agate (Orbicular Agate)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
fossil
Crinoid Stem Fossil
Class Crinoidea (Phylum Echinodermata), often preserved in Limestone or Calcite (CaCO3)
sedimentary
Slate
Metamorphosed Shale (Fine-grained Foliated Metamorphic Rock)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Coral / Petrifed Coral Agate
Silicified Anthozoa (Agatized Coral)
fossil
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Oak Wood (Wood Grain Pattern)
Quercus (genus)
Organic (Non-rock)
Amethyst and clear gemstone ring
Amethyst (purple quartz, SiO₂), likely set with colorless quartz or glass accents
gemstone
Dark glassy pebble, possibly volcanic rock
Likely basalt or volcanic glass (var. obsidian), unconfirmed from image
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
gemstone
Banded Calcite (often sold as Caribbean Calcite or Pink Calcite)
Calcium Carbonate (CaCO3)
mineral
Obsidian Arrowhead Replica (or similar knapped stone)
Obsidian (volcanic glass) or Chert
igneous
Chert / Flint (with Crinoid Stem Molds)
Microcrystalline Quartz (SiO2)
sedimentary
Likely fossilized shell or carbonate concretion
Indeterminate biogenic calcium carbonate, commonly calcite (CaCO₃)
fossil
Banded Calcite or Travertine
Calcium Carbonate (CaCO3)
Sedimentary
Small white mineral fragment
Indeterminate; possibly quartz, calcite, or feldspar
mineral
Iron meteorite fragment
Fe-Ni meteorite, likely an iron meteorite or stony-iron fragment
meteorite
Carnelian (Polished Agate/Jasper)
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
mineral
Blue Sapphire
Corundum (Al2O3)
gemstone
Crinoid Stem Fossil in Chert
Crinoid columnal ossicles (phylum Echinodermata) embedded in microcrystalline quartz (chert)
fossil
Pumice
Vesicular volcanic glass
igneous
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Greywacke Siltstone Pebble / Concretionary River Pebble
Siltstone / Argillite (Fine-grained Sedimentary Rock)
sedimentary