Raw Agate (Rough Lake Superior Agate or Jasper-Chalcedony Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Category
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Polished Tumbled Stone (Dark Chalcedony / Jasper)
Silicon Dioxide (SiO2)
mineral
Lake Superior Agate
Banded Chalcedony / Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Chert / Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Tumbled Chalcedony
Quartz (Silicon Dioxide - SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Moss Agate
Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Weathered iron-rich rock, possibly limonite/goethite
Limonite (hydrated iron oxides; commonly goethite, FeO(OH), mixed with hematite)
mineral
Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Sandstone (with Calcite or Silica veins)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (specifically Quartz Arenite)
sedimentary
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz in Matrix (possibly with Biotite or Hornblende)
Quartz (Silicon Dioxide, SiO2) in Granitic Matrix
igneous
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)
igneous
Quartz Geode
Crystalline Silver Oxide (SiO2) in Calcareous Host
mineral
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
mineral
Amethyst (Scepter/Double Terminated Point)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt with Agate/Chalcedony Infills
Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)
igneous
Basalt with Quartz/Feldspar Inclusions
Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining
igneous
Limestone Breccia
Sedimentary Breccia (Calcareous)
sedimentary
Mica Schist
Mica Schist (contains muscovite/biotite, quartz, plagioclase)
metamorphic
Banded Sandstone (Water-worn Pebble)
Arenite with mineral banding
sedimentary
Gneiss
Gneiss
metamorphic
Weathered, quartz-rich metamorphic rock (likely schist or gneiss)
Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining
metamorphic
Basalt with Epidote (Porphyritic Basalt)
Mafic Porphyritic Basalt with (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) inclusions
igneous
Ironstone Concretion (Nutstone)
Ironstone (with High Limonite/Hematite Content)
sedimentary
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Pyrite Schist
Metamorphic rock containing FeS2 (Pyrite) with mica and quartz
metamorphic
Epidote-bearing Rock
Epidote / Silicate mineral aggregate
metamorphic