Rock Identifier

Category

Mineral (Tectosilicate)

Browse mineral (tectosilicate) specimens identified by the Rock Identifier community.

Learn about Mineral (Tectosilicate) in the encyclopedia

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Euxenite

Eltyubyuite

Buergerite

Dolomite

Likely fluorite fragments (Fluorite (calcium fluoride, CaF₂)) — mineral

Likely fluorite fragments

Fluorite (calcium fluoride, CaF₂)

Mixed Mineral Collection (Multiple Mineral Species (Silicates and Oxides)) — mineral

Mixed Mineral Collection

Multiple Mineral Species (Silicates and Oxides)

Blue apatite crystal cluster (Apatite-group mineral, most likely fluorapatite — Ca₅(PO₄)₃F) — mineral

Blue apatite crystal cluster

Apatite-group mineral, most likely fluorapatite — Ca₅(PO₄)₃F

Likely serpentinite (green serpentine rock) (Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, and/or chrysotile)) — metamorphic

Likely serpentinite (green serpentine rock)

Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, and/or chrysotile)

Epidote (Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))) — mineral

Epidote

Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))

Limonite Ironstone (Goethite-Limonite concretion / Iron oxide) — sedimentary

Limonite Ironstone

Goethite-Limonite concretion / Iron oxide

Metamorphic rock with large feldspar crystals (likely porphyroblastic gneiss) (Feldspar-porphyroblastic gneiss; likely quartz and feldspar with mica/amphibole, identification from image only) — metamorphic

Metamorphic rock with large feldspar crystals (likely porphyroblastic gneiss)

Feldspar-porphyroblastic gneiss; likely quartz and feldspar with mica/amphibole, identification from image only

Banded Gneiss (Gneiss (Foliated Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (Foliated Metamorphic Rock)

Granite (Granite (composed mainly of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Mica)) — igneous

Granite

Granite (composed mainly of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Mica)

Gneiss (specifically Granite Gneiss) (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Gneiss (specifically Granite Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Granite (likely) (Granite, a quartz–feldspar–mica intrusive igneous rock) — igneous

Granite (likely)

Granite, a quartz–feldspar–mica intrusive igneous rock

Jasper (SiO2 (Cryptocrystalline quartz)) — mineral

Jasper

SiO2 (Cryptocrystalline quartz)

Blue Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Limonite (Yellow Ochre) (Hydrated Iron Oxide (FeO(OH)·nH2O)) — mineral

Limonite (Yellow Ochre)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Limonite and Goethite on Gossan (FeO(OH)·nH2O) — mineral

Limonite and Goethite on Gossan

FeO(OH)·nH2O

Limonite (Iron Ore) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Malachite (Copper(II) carbonate hydroxide [Cu2CO3(OH)2]) — mineral

Malachite

Copper(II) carbonate hydroxide [Cu2CO3(OH)2]

Ironstone (Limonite/Hematite) (Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)) — sedimentary

Ironstone (Limonite/Hematite)

Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)

Quartz (Druzy) (Silicon Dioxide (SiO2)) — mineral

Quartz (Druzy)

Silicon Dioxide (SiO2)

Ruby (Raw Corundum) (Corundum (Al2O3) with Chromium traces) — mineral

Ruby (Raw Corundum)

Corundum (Al2O3) with Chromium traces

Greenstone / Epidosite (Epidosite (primary minerals: Epidote and Quartz)) — metamorphic

Greenstone / Epidosite

Epidosite (primary minerals: Epidote and Quartz)

Green Jasper (Silicon Dioxide (SiO2) with mineral inclusions) — sedimentary

Green Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Botryoidal Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Botryoidal Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Small rough mineral fragment, possibly quartz or feldspar (Unidentified silicate mineral; image is insufficient for a reliable species identification) — mineral

Small rough mineral fragment, possibly quartz or feldspar

Unidentified silicate mineral; image is insufficient for a reliable species identification

Small tan mineral or rock fragment (unidentified) (Indeterminate from the image; no diagnostic features are visible) — mineral

Small tan mineral or rock fragment (unidentified)

Indeterminate from the image; no diagnostic features are visible

Small amber-colored mineral fragment (identity uncertain) (Undetermined; appearance alone is insufficient for a reliable mineral identification) — mineral

Small amber-colored mineral fragment (identity uncertain)

Undetermined; appearance alone is insufficient for a reliable mineral identification

Small cylindrical mineral/stone fragment (Undetermined; the image is insufficient for reliable mineral identification) — mineral

Small cylindrical mineral/stone fragment

Undetermined; the image is insufficient for reliable mineral identification

Tiger's Eye (Quartz pseudomorph after crocidolite (SiO2)) — gemstone

Tiger's Eye

Quartz pseudomorph after crocidolite (SiO2)

Limonite with Pyrite (Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O) — mineral

Limonite with Pyrite

Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O

Banded Sandstone (Beach Pebble) (Quartz Arenite Sandstone) — sedimentary

Banded Sandstone (Beach Pebble)

Quartz Arenite Sandstone

Likely iron-rich granite or granitic gneiss (Quartz–feldspar rock with iron-oxide staining; exact identification is uncertain from the image) — igneous

Likely iron-rich granite or granitic gneiss

Quartz–feldspar rock with iron-oxide staining; exact identification is uncertain from the image

Fine-grained brown-gray rock, possibly andesite (Likely andesite or another fine-grained volcanic rock; exact identification is uncertain from the photo) — igneous

Fine-grained brown-gray rock, possibly andesite

Likely andesite or another fine-grained volcanic rock; exact identification is uncertain from the photo

Devil's Toenail (Fossil Oyster) (Gryphaea arcuata (Calcium Carbonate, CaCO3)) — sedimentary

Devil's Toenail (Fossil Oyster)

Gryphaea arcuata (Calcium Carbonate, CaCO3)

Banded gneiss (Gneiss, a foliated metamorphic rock; likely quartz–feldspar–mica gneiss) — metamorphic

Banded gneiss

Gneiss, a foliated metamorphic rock; likely quartz–feldspar–mica gneiss

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Topaz (Al_2SiO_4(F,OH)_2) — gemstone

Topaz

Al_2SiO_4(F,OH)_2

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)