Amygdaloidal Basalt with Agate/Zeolite Amygdules
Basalt (extrusive igneous rock) containing secondary mineral fillings
igneous
Category
Sedimentary Or Igneous (Secondary Formation)
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Mixed Rock Collection
Polylithic Geological Specimen Mix
sedimentary and igneous
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Calcite (with iron oxide staining)
Calcium Carbonate (CaCO3)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Copper Ore
Cupriferous Rock / Mixed Mineral Matrix
igneous
Chert (Common Opal/Jasper transition)
Silicon Dioxide (SiO2)
sedimentary
Manganese Ore (Psilomelane/Pyrolusite)
Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)
Mineral
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Goethite
mineral
Yellow Sapphire
Corundum (Al2O3)
gemstone
Quartz with Iron Stains
Silicon Dioxide (SiO2) with FeOx inclusions
mineral
Nuummite
Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)
metamorphic
Botryoidal goethite/limonite specimen
Goethite (α-FeO(OH)), commonly mixed with limonite and iron oxides
mineral
Gneiss
Granitic Gneiss
metamorphic
Turquoise and Hematite
Turquoise: CuAl6(PO4)4(OH)8·4H2O; Hematite: Fe2O3
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite (likely with weathered Limonite/Hematite)
Magnetite (Fe3O4) with iron oxide weathering
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Gneiss
Gneiss
metamorphic
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Rounded gray pebble
Unidentified lithic pebble; likely quartz-rich sandstone, quartzite, or fine-grained igneous rock
sedimentary
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Limonite with Galena
FeO(OH)·nH2O (Limonite) and PbS (Galena)
mineral
Green Gneiss
Metamorphic Gneiss
metamorphic
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Basalt with Amygdules
Extrusive Igneous Rock (Mafic)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Greenstone
Metabasalt / Greenschist
metamorphic
Yellow Ocher (Iron-rich Silt/Clay)
Goethite-rich Limonite (FeO(OH)qnH2O)
sedimentary
Eucrite Meteorite
Achondrite (Eucrite)
meteorite
Sandstone (Red)
Arenite (primarily Quartz, SiO2, with Iron Oxide cement)
sedimentary
Rhyolite (possibly porphyritic and altered)
Volcanic felsic rock; primarily quartz, alkali feldspar, plagioclase, and volcanic glass, with iron-oxide alteration
igneous
Polished dark-speckled igneous pebble, likely diorite or gabbro
Probable diorite (plagioclase feldspar and hornblende/biotite); exact identification is uncertain from the image
igneous
Puddingstone (Gowganda)
Gowganda Formation Conglomerate
sedimentary
K-Feldspar Granite Fragment
Granite (Alkali Feldspar-rich)
igneous
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety
Mineral
Goethite (likely as part of Limonite/Ironstone)
Goethite (α-FeOOH)
Mineral