Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Category
Mineral, Metal (Element)
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Iron-rich sandstone (Gozan/Ironstone)
Ferruginous Sandstone (clastic sedimentary rock)
sedimentary
Chert (variations include Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Metallic sulfide ore, possibly pyrite-rich
Pyrite (FeS₂), potentially mixed with chalcopyrite, galena, or iron oxides
mineral
Granite / Pegmatite with Quartz Vein
Granite (composed mainly of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)
igneous
Lepidolite on Quartz
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite) / SiO2 (Quartz)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Granite
Felsic intrusive igneous rock
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Olivine (Peridot Stone)
(Mg, Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Mineral
Diamond jewelry pendant or cluster
Diamond, crystalline carbon (C), likely mounted in metal
gemstone
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Intrusive Igneous Rock)
igneous
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Granite
Intrusive Igneous Rock
igneous
Quartz–feldspar pegmatite fragment
Granitic pegmatite; chiefly quartz (SiO₂) and feldspar, with possible mica/amphibole
igneous
Faceted quartz crystal sphere (likely rock crystal)
Quartz, silicon dioxide (SiO₂)
gemstone
Iron Gossan (Limonite/Goethite)
Hydrated Iron Oxides (FeO(OH)·nH2O) from oxidation zones
sedimentary
Galena-rich sulfide specimen
Galena (lead sulfide, PbS), possibly with sphalerite or other sulfides
mineral
Native silver (likely)
Silver, Ag; possibly silver-bearing sulfide or mica contamination
mineral
![Fossilized bone fragment, possibly vertebrate tooth or jaw (Mineralized vertebrate bone; commonly apatite [Ca5(PO4)3(F,OH,Cl)] replacing original bone) — fossil](https://media.rock.id/fossilized-bone-fragment-possibly-61c674c8-cc46-4b4b-a8c4-f8e6ba2095b9-thumbnail.jpg)
Fossilized bone fragment, possibly vertebrate tooth or jaw
Mineralized vertebrate bone; commonly apatite [Ca5(PO4)3(F,OH,Cl)] replacing original bone
fossil
Pallasite Meteorite (likely Imilac or Brenham)
Stony-Iron Meteorite (Pallasite)
mineral
Gold Nugget
Native Gold (Au)
mineral
Aura Quartz / Rainbow Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Native Copper
Native Copper (Cu)
mineral
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Granite
Granite
igneous
Copper-bearing chrysocolla/azurite host rock (probable)
Chrysocolla, Cu₂H₂Si₂O₅(OH)₄·nH₂O, with possible azurite Cu₃(CO₃)₂(OH)₂ in iron-stained quartz/matrix
mineral
Sphalerite in Chalcedony (Crescent Carving)
Zinc Sulfide (ZnS) with Silicon Dioxide (SiO2)
mineral
Mixed gemstone bead bracelet
Likely rose quartz, amethyst, and possibly rhodonite or lepidolite beads
gemstone
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Quartz Vein in Host Rock (Likely Slate or Shale)
Hydrothermal Quartz (SiO2) in Pelitic host rock
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Gold Nugget
Native Gold (Au)
mineral
Limonite with Quartz (Gossan)
Hydrated iron(III) oxide-hydroxide mixture (FeO(OH)·nH2O) with Silicon Dioxide (SiO2)
Mineral
Small faceted gemstone, likely diamond
Diamond (crystalline carbon, C)
gemstone
Ruby and Sapphire Cluster Ring
Corundum (Al2O3)
gemstone