Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Category
Not A Geological Specimen
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Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
sedimentary
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Obsidian
Obsidian (Amorphous volcanic glass)
igneous
Granite (weathered pebble)
Granite (plutonic igneous rock)
Igneous
Obsidian
Volcanic glass (Mainly SiO2)
igneous
Diamond
Carbon (C)
mineral
Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Fluorite (Green)
Fluorite (Calcium Fluoride, CaF2)
mineral
Spinosaurus Tooth Fossil
Spinosaurus aegyptiacus (Calcium Phosphate/Apatite)
sedimentary
Quartz Vein in River Siltstone
Crystalline Quartz (SiO2) in Siliclastic Matrix
sedimentary
Rugose Coral Fossil
Rugosa (Order)
sedimentary
Quartz with Limonite Staining
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
Mineral
Slag Glass (Cullet Glass)
Amorphous Silica (Industrial byproduct)
mineral
Bumblebee Jasper
Calcite-bearing Volcanic Tuff containing Orpiment (As2S3) and Realgar (As4S4)
sedimentary
Diamond
Carbon (C)
gemstone
Limonite (Iron Ore)
Limonite; FeO(OH)·nH2O
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Limonite (Ironstone)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Dalmatian Stone
Dalmatian Jasper (Aplitic Rock)
igneous
Amber
Fossilized Tree Resin (Succinate)
mineral
Limonite/Goethite Concretion
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Dalmatian Stone
Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)
igneous
Limonite / Ironstone
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Citrine
SiO2 (Silicon Dioxide)
Mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Caliche (also known as hardpan, calcrete, kankar)
Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.
Mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Amber
Succinite
Mineraloid
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (composed primarily of Quartz and Iron Oxide)
sedimentary
Amber
Succinite (specifically Baltic Amber) - Formula: C10H16O (approximate)
Organic Mineraloid
Jet
Lignite (Anthracite-grade compact coal)
sedimentary
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Obsidian
Obsidian (volcanic glass), predominantly amorphous SiO₂
Igneous