Garden Pebble (Quartzite or Limestone fragment)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment
sedimentary
Category
Non Geological
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N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Emerald in Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Anthracite Coal
Carbon (with trace impurities)
sedimentary
Synthetic Costume Accessory (Non-Geological)
Polyester and Acrylic Fiber (Anthropogenic polymer)
Synthetic / Man-made textile
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Obsidian
Volcanic Glass (70% or more SiO2)
igneous
Black Obsidian
Volcanic Glass (Silicon Dioxide with impurities)
igneous
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
sedimentary
Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)
Blue Goldstone
Aventurine Glass
Man-made mineral simulant (Glass)
Sandstone with Liesegang Rings
Liesegang-banded Sandstone
sedimentary
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Tektite (Indochinite)
Tektite (High-silica impact glass)
igneous
Fossil shell fragment (likely brachiopod or bivalve)
Indeterminate fossilized carbonate shell; likely Brachiopoda or Bivalvia
fossil
Anthracite Coal
Anthracite
sedimentary
Obsidian
Amorphous volcanic glass (primarily SiO2)
igneous
Gold Ore in Matrix
Native Gold (Au) in Quartz/Limonite host rock
mineral
N/A (Non-Geological Specimen)
N/A
Pearl-and-gemstone insect brooch
Pearl: nacre (aragonite, CaCO₃); colored stones are likely synthetic or natural corundum/spinel/glass, not determinable from the image
gemstone
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
mineral (impactite)
Weathered agate or chalcedony nodule
Microcrystalline quartz (SiO₂), likely agate/chalcedony with iron-oxide staining
mineral
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Obsidian
Obsidian (volcanic glass)
igneous
Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Synthetic material (Not a natural rock/mineral)
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities
mineraloid
Black Obsidian
Volcanic Glass (SiO2)
igneous
Tektite (Indochinite)
Impact Glass (SiO2 + Al2O3)
mineraloid
Obsidian
Volcanic Glass (Rich in SiO2)
igneous
Quartzite Pebble
Quartzite
metamorphic
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Bull Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Black Obsidian
Volcanic Glass (SiO2)
igneous
Black Tourmaline (Schorl)
Sodium Iron Aluminum Borosilicate (NaFe2+3Al6(BO3)3Si6O18(OH)4)
mineral
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Quartzite
Metamorphic rock (SiO2)
metamorphic