Scoria with Calcite Infills
Vesicular Basalt with secondary Calcification (CaCO3)
igneous
Category
Mineral (Synthetic)
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Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
metamorphic
Limonite (Yellow Ochre)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Malachite
Copper carbonate hydroxide Cu2CO3(OH)2
mineral
Sandstone Pebble
Arenite (SiO2 principal)
sedimentary
Yellow Aventurine
Quartz (Silicon Dioxide) with Mica inclusions (SiO2)
mineral
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Limonite with Hematite
Hydrated iron(III) oxide-hydroxide with variable composition (FeO(OH)·nH2O)
mineral
Limonite with Trace Fossils
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
White Calcite
Calcium Carbonate (CaCO3)
mineral
Turquoise in Matrix
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
sedimentary
Pyrite-rich Ore
Pyrite (FeS2) with secondary minerals
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Gneiss
Gneiss (quartz-feldspar-biotite gneiss)
metamorphic
Gneiss
Metamorphic rock of high-grade regional metamorphism
metamorphic
Pegmatite with Schorl (Black Tourmaline) and Mica
Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)
igneous
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Gold in Matrix
Native Gold (Au)
mineral
Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz (with Chlorite/Mineral Inclusions)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Granite (Thin Section)
Granite (Felsic Plutonic Rock)
igneous
Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
Native Copper
Native Copper (Cu)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz (Granular Milky Quartz fragment)
Silicon Dioxide (SiO2)
mineral
Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Hematite (Concretion)
Iron(III) oxide (Fe2O3)
mineral
Orthoclase Feldspar (Twinning Specimen)
Orthoclase (KAlSi3O8)
mineral
Fluorite (Purple Fluorite in Matrix)
Fluorite (Calcium Fluoride, CaF2)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Snowflake Obsidian
Spherulitic Obsidian (primarily SiO2)
igneous
Calcite with Quartz coating
Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Limonite Concretion
Limonite (FeO(OH)·nH2O)
sedimentary
Amethyst (Purple), Sulfur (Yellow), and Blue Apatite
SiO2 (Quartz), S (Native Sulfur), Ca5(PO4)3(F,Cl,OH) (Apatite Group)
mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions
igneous
Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral