Goldstone
Aventurine glass
mineral (man-made glass)
Category
Anthropogenic (Man Made Product Subject To Geological Processes)
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Tumbled red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides
mineral
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Likely iron-rich slag or weathered ironstone
Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag
mineral
Tumbled brown jasper (likely iron-rich chalcedony)
Jasper, opaque microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Polished striped jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay inclusions
sedimentary
Tumbled jasper or chalcedony
Microcrystalline quartz (SiO₂), probably iron-stained jasper/chalcedony
mineral
Mixed rock and mineral collection
Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials
mineral
Tumbled quartz-rich rock, likely quartzite or milky quartz with iron-oxide staining
Quartzite (primarily SiO₂), possibly with hematite/goethite staining and minor feldspar or mica
metamorphic
Gold-bearing Quartz Vein in Mafic Rock
Hydrothermal Quartz Vein within Greenschist/Amphibolite facies (SiO2 with Au)
metamorphic
Banded gneiss pebble
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Quartz vein rock with iron-stained matrix
Quartz (SiO₂), likely with limonite/goethite and minor feldspar or mica
mineral
Quartzite Pebble
Quartzite (Metamorphosed Sandstone)
metamorphic
Sandstone (likely a river or beach pebble)
Sandstone (a clastic sedimentary rock)
Sedimentary Rock
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Ruby in Zoisite
Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (specifically a rock composed of minerals)
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
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N/A
Quartzite
Metamorphic Quartz Arenite
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Turquoise
Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)
Mineral
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Coal
Bituminous or Anthracite coal (carbon-rich sedimentary rock)
sedimentary
Quartzite
Quartzite (primarily SiO2)
Metamorphic
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Pink Marble
Recrystallized Limestone (Calcium Carbonate, CaCO3)
metamorphic
Quartzite Cobble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Likely serpentine (serpentinite) pebbles
Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly Mg₃Si₂O₅(OH)₄, sometimes containing magnetite, chromite, and minor carbonate minerals
metamorphic