Basalt

Basalt (Vesicular or Porphyritic)

Basalt (composed primarily of plagioclase feldspar, pyroxene, and olivine)

Diorite (Salt and Pepper Rock)

Diorite (comprising Plagioclase Feldspar, Hornblende, and Biotite)

Granodiorite

Granodiorite

Zebra Jasper

Jasper (variety of Quartz/Chalcedony), SiO2

Vesicular Basalt (Scoria)

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Rough Green Sapphire (Corundum)

Corundum (Al2O3 - Aluminum Oxide with trace elements)

Amethyst

Amethyst (variety of Quartz, SiO2)

Greenstone

Greenschist (commonly containing Chlorite, Actinolite, and Epidote)

Greenschist

Greenschist (Chlorite Schist)

Amethyst Geode

Silicon dioxide (SiO2) with iron impurities

Quartz Geode (partially formed)

Silicon Dioxide (SiO2)

Carnelian

SiO2 (Silicon Dioxide) - Translucent reddish-brown variety of Chalcedony

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Bauxite

Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

Greenschist

Greenschist (Major minerals include Chlorite, Actinolite, and Epidote)

Epidote (likely Pistacite in Epidosite rock)

Epidote: Ca2(Al,Fe)3(SiO4)3(OH)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Greenstone (Greywacke or Nephrite Jade variant)

Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)

Greenschist / Greenstone

Greenschist facies metabasite

Plagioclase Feldspar

Plagioclase Feldspar Series (NaAlSi3O8 - CaAl2Si2O8)

Druzy Quartz on Vesicular Basalt

Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock

Basalt with Garnet inclusions

Basalt containing Nesosilicate (Garnet Group, likely Almandine Fe3Al2Si3O12)

Amygdaloidal Basalt with Zeolite/Quartz Infill

Amygdaloidal Basalt (Host: (Mg,Fe)2SiO4 / CaAl2Si2O8; Infill: SiO2 or Na2Al2Si3O10·2H2O)

Olivine (Peridot)

Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)

Basalt with Olivine Phenocrysts

Porphyritic Basalt (Mineral formula of Olivine: (Mg,Fe)2SiO4)

Basalt (River Stone)

Basalt (Aphanitic mafic volcanic rock)

Olivine (Peridotite)

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Peridotite (with Olivine)

Peridotite (rich in Olivine, (Mg,Fe)2SiO4)

Basalt with Iron Oxidation

Extrusive Mafic Igneous Rock (composed of Plagioclase and Pyroxene)

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Diabase (Dolerite) Cobble

Diabase / Dolerite

Basalt (River Pebble)

Basalt (Aphanitic Mafic Volcanic Rock)

Epidote

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Prehnite

Prehnite, Ca2Al(AlSi3O10)(OH)2

Basalt with Epidote (Flowerstone-like texture)

Amygdaloidal Basalt (silicate mineral inclusions)

Jasper with Iron Staining

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Olivine (Peridotite)

Magnesium iron silicate (Mg, Fe)2SiO4

Labradorite

Labradorite (Ca, Na)(Al, Si)4O8

Apricot Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Greenschist

Chlorite schist

Carnelian Agate

Chalcedony (SiO2) with iron oxide inclusions

Greenstone (Epidosite or Altered Basalt)

Epidosite (Ca2(Al, Fe)3(SiO4)3(OH))