Metamorphic Rock (Composed Of Multiple Minerals)

Garnet Schist

Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)

Calcite

Calcite (CaCO₃, Calcium Carbonate)

Strawberry Quartz (Quartz with Hematite inclusions)

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

White Jade / White Chalcedony

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)

Green Aventurine and Clear Quartz

Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)

Quartz (Smoky/Milky Variety)

Silicon Dioxide (SiO2)

Magnetite (or Magnetic Iron Ore)

Magnetite (Fe3O4)

Quartzite with inclusions

Metamorphic Rock (Mainly SiO2)

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Emerald in Matrix (Quartz/Schist)

Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities

Osumilite in Granite Matrix

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Granite (Thin Section)

Granite (Felsic Plutonic Rock)

Pink Granite

Phaneritic Plutonic Felsic Rock (Granite)

Shale

Shale (clastic sedimentary rock)

Greenstone / Serpentinite

Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn silicate minerals including Antigorite, Lizardite, and Chrysotile)

Basalt

Basalt

Coquina

Coquina (Bioclastic Limestone)

Granite Cobble

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Granite Pebble

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Gneiss (Banded Gneiss)

Gneiss

Quartz

Quartz (SiO₂)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Quartz vein in metamorphic rock

Crystalline Silicon Dioxide (SiO2) in Host Rock

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Tiger Iron

Tiger Iron (Hematite, Red Jasper, and Tiger's Eye)

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Blue Quartz

Quartz (SiO2) with inclusions

Sandstone with trace fossil

Sandstone, possibly with Skolithos or similar trace fossil

Quartz (in a rock matrix)

Quartz (SiO2)

Coarse Sandstone

Arenite (SiO2 based)

Schist

Mica Schist

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Granite

Granite (composed of Quartz, Feldspar, and Mica)

Diabase (Trap Rock)

Diabase (also known as Dolerite)

Tiger's Eye

Silicon dioxide (SiO2) with fibrous inclusions of crocidolite

Diorite

Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)

Concretion or Geode (unbroken)

Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.