Mineral Based Composite

Granite

Granite (Felsic Plutonic Rock)

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Labradorite (Tumbled)

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Labradorite

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

Dendritic Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions

Mica (Biotite or Phlogopite variety)

Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)

Fuchsite (Chrome Mica)

Cr-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2

Dark fine-grained rock, likely basalt

Basalt; chiefly plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Sandstone with Liesegang Rings

Quartzose Sandstone with Iron Oxide Precipitation

Granite

Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O

Granite

Granite (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)

Likely weathered basalt or basaltic rock

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Mica Schist

Mica Schist (predominantly Muscovite or Biotite series)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide staining)

Vesicular Basalt with Quartz

Vesicular Basalt (SiO2 inclusions)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Citrine

Citrine (Silicon Dioxide, SiO2)

Tree Agate

Dendritic Agate (Silicon Dioxide - SiO2)

Citrine

Silicon Dioxide (SiO2)

Labradorite

Feldspar (variety of Anorthite), (Ca,Na)(Al,Si)4O8

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Mica Schist

Muscovite/Biotite Schist

Quartz / Quartzite Fragment

Silicon Dioxide (SiO2)

Vesicular basalt (likely weathered lava rock)

Basalt, predominantly calcium-rich plagioclase, pyroxene, and commonly olivine; vesicular texture from gas bubbles

Amphibolite / Biotite Schist

Amphibolite (rich in Hornblende and Plagioclase feldspar)

Basalt Pebble

Basalt (Aphanitic Mafic Igneous Rock)

Biotite Gneiss

Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)

Granite

Phaneritic plutonic rock composed of Quartz, Feldspar, and Mica

Basalt with Quartz/Calcite Inclusion

Aphanitic Mafic Igneous Rock (Basalt) with SiO2 or CaCO3 vein

Basalt with Quartz Vein

Aphanitic Mafic Igneous Rock with Silicon Dioxide (SiO2) intrusion

Porphyritic Pink Granite

Phaneritic Porphyroid Granite

Granite

Granite (Phaneritic igneous rock)

Granite

Granite (Felsic Plutonic Rock)

Fuchsite

Chromium-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2

Aquamarine

Beryl (Be3Al2Si6O18)

Labradorite (likely)

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