Dark vesicular volcanic rock, likely scoria
Scoria; predominantly basaltic or andesitic volcanic glass with plagioclase, pyroxene, and olivine
igneous
Category
Igneous Rock (Volcanic Glass)
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Vesicular volcanic rock, likely pumice or scoriaceous rhyolite
Vesicular rhyolite/dacite; predominantly silica-rich volcanic glass with feldspar and quartz
igneous
Druzy Quartz (part of a Geode)
Silicon Dioxide (SiO2)
mineral
Vesicular volcanic rock, likely pumice or scoriaceous rhyolite
Vesicular rhyolite/dacite; predominantly volcanic glass and feldspar, with iron-oxide staining
igneous
Scoria
Scoriaceous Basalt
igneous
Basalt
Extrusive Igneous Rock
igneous
Porphyry
Porphyritic Igneous Rock
igneous
Amygdaloidal Basalt
Extrusive Igneous Rock with Amygdules
igneous
Basalt
Extrusive igneous rock
igneous
Agate-bearing rhyolite (likely polished/cut specimen)
Silica-rich volcanic rock containing microcrystalline quartz/chalcedony, SiO₂, with feldspar and possible iron oxides
igneous
Vesicular volcanic rock, likely weathered scoria
Scoria (vesicular basaltic-andesitic volcanic rock), composition approximately plagioclase, pyroxene, and volcanic glass
igneous
Tumbled Agate
Silicon dioxide (SiO2)
sedimentary
Red vesicular volcanic rock, likely scoria
Scoria (vesicular basalt/andesite), composition mainly plagioclase, pyroxene, iron oxides, and volcanic glass
igneous
Porphyritic Basalt (or Andesite) containing Augite
Porphyritic Mafic Volcanic Rock
igneous
Basalt Pebble
Basalt (Mafic Volcanic Rock)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt River Stone
Basalt (Mafic volcanic rock)
igneous
Andesite
Andesite (Intermediate Volcanic Rock)
igneous
Basalt with Xenolith
Extrusive Igneous Rock containing Mantle Xenolith
igneous
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Basalt Porphyry
Porphyritic Basalt
igneous
Basalt River Pebble
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in Rhyolitic Matrix
igneous
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Basalt
Aphanitic Mafic Igneous Rock
igneous
Rounded dark river pebble
Indeterminate mafic rock, possibly basalt or fine-grained andesite
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt with Calcite Veins
Extrusive Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Vesicular Basalt
Mafic Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Dalmation Jasper
Aplite with Arfvedsonite inclusions (SiO2 with Na3(Mg,Fe2+)4AlSi8O22(OH)2)
igneous
Amygdaloidal Basalt
Basalt (Igneous Volcanic Rock with secondary mineral infilling)
igneous
Basalt with Quartz Vein
Mafic Igneous Rock (Basalt) with SiO2 (Quartz) Vein
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Vesicular basalt (scoria)
Basaltic scoria; chiefly plagioclase, clinopyroxene, olivine, and volcanic glass
igneous
Likely polished basalt or iron-rich metamorphic rock
Basaltic rock, chiefly plagioclase and pyroxene; exact identification requires testing
igneous
Vesicular volcanic rock, likely pumice or scoria
Pumice/scoria; predominantly volcanic glass with feldspar, pyroxene, and possibly olivine
igneous