Quartz-rich pegmatite with mica and dark inclusions
Pegmatite; chiefly quartz (SiO₂), with feldspar and biotite/tourmaline inclusions
igneous
Category
Mineral (Impactite)
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Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
sedimentary
Polished orbicular jasper (likely ocean jasper)
Silicified volcanic rock; microcrystalline quartz/chalcedony (SiO₂) with iron oxides and altered volcanic minerals
metamorphic
Polished copper-bearing mineral specimen, likely malachite-rich copper ore
Malachite, Cu₂CO₃(OH)₂, possibly mixed with chrysocolla or limonite
mineral
Small tumbled orange-brown mineral fragment
Indeterminate; possibly iron-stained quartz, carnelian, or orange calcite
mineral
Mixed Mineral and Fossil Collection
Multi-specimen assemblage (SiO2, CaCO3, FeS2, etc.)
mineral
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica
igneous
Greenstone / altered basalt (probable)
Chlorite–epidote–actinolite aggregate; commonly metabasalt (greenstone)
metamorphic
Carved serpentine wing sculpture
Serpentine-group rock, chiefly antigorite/lizardite: Mg3Si2O5(OH)4
metamorphic
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Possible fossilized bone fragment
Indeterminate fossil bone; no species can be identified from this image
fossil
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Iron-stained milky quartz
Quartz (SiO₂), with iron-oxide staining
mineral
Iron-stained milky quartz pebble
Quartz (SiO₂), commonly with iron-oxide staining
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Limonite Concretion
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Biotite-rich gneiss (probable)
Foliated quartz–feldspar–biotite gneiss; composition commonly includes quartz (SiO₂), feldspar, and biotite mica
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Limonite Geode / Ironstone Concretion
Hydrated iron oxide-hydroxide (FeO(OH)·n H2O)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Conglomerate (or Breccia / Porphyry)
Clastic Sedimentary Rock (Conglomerate / Sandstone)
sedimentary
Polished blue-gray mineral specimen, likely galena-bearing ore
Galena (PbS), possibly mixed with quartz/calcite and secondary copper minerals
mineral
Limonite (Iron Ore/Bog Iron)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Unidentified rough mineral fragments
Likely quartz- or feldspar-bearing rock; exact identification requires testing
mineral
Quartz-bearing pegmatitic rock, likely granite/pegmatite
Feldspar–quartz pegmatite; chiefly K-feldspar, plagioclase, quartz, and possible mica
igneous
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Quartz-bearing pegmatite
Quartz (SiO₂) with feldspar and mica, likely a granitic pegmatite
igneous
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone Pebble
Arenite (Sandstone)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Pegmatite (with Muscovite Mica and Quartz)
Granitic Pegmatite (chiefly KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)
igneous
Granite
Granite (composed primarily of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Amphibole)
igneous