Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Man Made (Synthetic Rock)
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Emerald in Matrix
Beryl (Be3Al2Si6O18) with Quartz/Schist
gemstone
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Unakite
Unakite (Epidotized Granite)
metamorphic
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt Fragment
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Slate
Metamorphic Pelitic Rock
metamorphic
Druzy Quartz on Limestone
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Extrusive Igneous Rock
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Quartzite with Calcite Accretion
Metamorphosed Quartz Sandstone (SiO2 with CaCO3 coating)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Granite (Gneissic / Weathered Pebble)
Felsic intrusive igneous rock (Granite)
igneous
Dark mafic igneous rock, likely basalt or gabbro
Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Weathered basalt or mafic volcanic rock
Basalt; typically plagioclase feldspar, clinopyroxene, and often olivine or iron oxides
igneous
Basalt with Vesicular Amygdule
Extrusive igneous rock (Mafic)
igneous
Crushed Granite Gravel
Granite (Plagioclase feldspar, Quartz, Alkali feldspar, Biotite)
igneous
Greenstone / Serpentinite
Serpentinite (composed primarily of serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Sandstone Pebble (Ventifact)
Arenite (mostly SiO2)
sedimentary
Serpentine
Antigorite/Chrysotile group (Mg3Si2O5(OH)4)
metamorphic
Sandstone (Greywacke)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Dark basalt or fine-grained mafic rock
Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine or iron-titanium oxides
igneous
Granite Pebble
Granite
igneous
Sandstone (Pebble)
Sandstone (SiO2 dominated clastic sedimentary rock)
sedimentary
Siltstone or Mudstone
Argillaceous sedimentary rock
sedimentary
Polished basalt (likely vesicular basalt)
Basalt; predominantly plagioclase, clinopyroxene, and commonly olivine or iron-titanium oxides
igneous
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/054f3fa7-f73a-456a-b566-38d3b6295e69-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Granite (Specimen: Logan Rock)
Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)
igneous
Fine-grained dark igneous rock, likely basalt
Basalt; predominantly plagioclase feldspar and pyroxene, commonly with minor olivine and iron-titanium oxides
igneous
Graphic Granite (or Rapakivi-textured Granite)
Alkali feldspar granite
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Ironstone (Limonitic Concretion)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions
sedimentary
Banded Sedimentary Rock
Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands
sedimentary
Fenestella Bryozoan Fossil
Fenestella (class Stenolaemata)
fossil
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Garden Boulder)
Sandstone (SiO2 dominated)
sedimentary
Limestone (specifically Dolomitic/Crystalline Limestone)
Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)
sedimentary
Basalt
Extrusive Igneous Rock
igneous