Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Category
Man Made Object (Coin)
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Aura Quartz
Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)
mineral
Uncertain light-colored stone on polished granite
Likely granite background; small specimen not confidently identifiable
igneous
Blue calcite (probable)
Calcite, calcium carbonate (CaCO₃)
mineral
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Diamond (Cut jewelry specimen)
Diamond (pure Carbon, C)
mineral
Ruby in Matrix
Corundum (Al2O3)
mineral
Basalt
Basalt
Igneous
Laterite
Laterite (Iron- and aluminum-rich rock)
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Rose Quartz (likely carved)
Rose Quartz (SiO2)
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Diamond (Cut and Polished)
Diamond (pure Carbon, C)
gemstone
Diamond
Carbon (C)
mineral
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Pumice
Pumice (Vitreous volcanic rock)
igneous
Chert (specifically Flint Arrowhead)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Small pale mineral fragment
Unidentified; possibly quartz, calcite, or feldspar
mineral
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Tumbled honey calcite
Calcite (CaCO₃), likely iron-stained variety
mineral
Rhodochrosite Pebble
MnCO3 (Manganese Carbonate)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Bauxite
Bauxite (Mixture of Hydrous Aluminum Oxides)
sedimentary
Fossil Sea Urchin (Echinoid)
Echinoidea fossil (often replaced by silica or calcite)
fossil
Fluorite
Calcium Fluoride (CaF2)
mineral
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Obsidian
Volcanic Glass (70% or more SiO2)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Pumice
Pumice (Vesicular volcanic glass)
Igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Watermelon Tourmaline
Elbaite - Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3OH
mineral