Mineral

Diorite

Diorite (Intermediate intrusive igneous rock)

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Banded Gneiss

Gneiss (high-grade metamorphic silicate rock)

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Gneiss

Gneiss (high-grade metamorphic rock)

Foliated amphibolite (likely augen or spotted amphibolite)

Amphibolite, composed chiefly of hornblende and plagioclase; exact identification requires close examination

Orange feldspar pebble (likely potassium feldspar)

Likely orthoclase or microcline, KAlSi₃O₈

Limonite Concretion

Limonite (FeO(OH)·nH2O) Pseudomorph

Banded Sandstone (River Cobble)

Arenite Sandstone with heavy mineral layering

Weathered granite boulder

Granite, a quartz–feldspar-rich intrusive igneous rock

Likely pink granite

Granite, a coarse-grained felsic intrusive igneous rock, typically quartz + feldspar + mica

Polished rhyolite (likely rainforest jasper)

Rhyolite, a silica-rich volcanic rock; exact identification cannot be confirmed from the photo

Granite (likely weathered)

Granite, a quartz–feldspar–mica intrusive igneous rock

Tumbled pink granite

Granite (quartz, feldspar, and mica; exact variety uncertain)

Banded Sedimentary Rock

Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands

Fossil Sea Urchin (Echinoid)

Echinoidea fossil (often replaced by silica or calcite)

Granite

Felsic intrusive igneous rock

Nephrite Jade

Nephrite

Likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, or chrysotile)

Quartz-rich pegmatite, likely with iron staining

Granitic pegmatite, chiefly quartz (SiO₂) and feldspar, with possible mica and iron oxides

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly with quartz and feldspar

Iron-stained banded gneiss

Quartz–feldspar gneiss with iron-oxide staining; exact minerals cannot be confirmed from the image

Limonite (Iron Ore)

Hydrated ferric oxide mixture (FeO(OH)·nH2O)

Fluorite

Calcium Fluoride (CaF2)

Limonite

FeO(OH)·nH2O

Limonite/Goethite (Iron Ore)

Hydrous ferric oxides (FeO(OH)·nH2O)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)

Iron Ore (Limonite and Hematite)

Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)

Garden Quartz (Lodalite)

Silicon Dioxide with various mineral inclusions (SiO2)

Likely granitic gneiss pebble

Quartz–feldspar–biotite gneiss (visual identification; exact type uncertain)

Mica Schist / Granite

Mica Schist (Silicate metamorphic rock)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Likely greenstone (metamorphosed mafic rock)

Greenschist or altered basalt; exact identification is uncertain from the image

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica, possibly with gneissic foliation

Iron-stained quartz vein in weathered host rock

Quartz (SiO₂) with iron-oxide/hydroxide staining; host rock undetermined

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Polished granite (likely gneissic or migmatitic granite)

Granite, a quartz–feldspar plutonic rock; exact variety cannot be determined from the image

Limonite (Iron Ore / Ochre)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Garnet-bearing quartz (likely almandine garnet in milky quartz)

Quartz (SiO₂) with garnet, likely almandine (Fe₃Al₂(SiO₄)₃)

Merlinite (dendritic opal)

Common opal (hydrated amorphous silica, SiO₂·nH₂O) with dark manganese-oxide dendrites; the trade name “merlinite” is also applied to other patterned stones.