Pyrite in Quartz
FeS2 (Iron Pyrite) with SiO2 (Quartz)
Mineral/Igneous/Hydrothermal
Category
Man Made Glass (Often Grouped With Minerals In Lapidary)
Browse man made glass (often grouped with minerals in lapidary) specimens identified by the Rock Identifier community.
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Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Serpentine
Serpentinite (group of minerals including Antigorite, Lizardite, or Chrysotile) (Mg, Fe)3Si2O5(OH)4
metamorphic
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)
N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)
Organic (if resin) or Synthetic (if glass); simulating Sedimentary or Metamorphic (for natural stones)
Quartz
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Rhyolite
Rhyolite (felsic volcanic rock) with amygdules
igneous
Chert (Grey-Green Flint)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Moldavite
Silica glass with small amounts of aluminum, iron, and other elements
Mineraloid / Tektite
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Polished/tumbled jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and other mineral impurities
mineral
Obsidian
Obsidian (Volcanic glass, primarily SiO2)
igneous
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Metamorphic rock
Quartz-rich pegmatite (likely milky quartz with feldspar and mica)
Granite pegmatite; chiefly quartz (SiO₂), with feldspar and mica-group minerals
igneous
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Quartz with Tourmaline
Silicon Dioxide with complex boro-silicate (Quartz: SiO2)
mineral
Quartz (Rose Quartz or Chert variant)
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
mineral
Chert (specifically Gray/Blue-Gray Chert)
Chert (SiO2)
sedimentary
Vein Quartz in Basalt or Mafic Rock
Silicon Dioxide (Quartz veins in volcanic host rock)
igneous
Malachite with Chrysocolla
Copper carbonate hydroxide (Cu2CO3(OH)2) and Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
K-Feldspar / Granite Pegmatite
Potassium Feldspar (Microcline/Orthoclase) with Quartz
igneous
Garnet
Garnet Group (Silicate mineral); general formula X3Y2(SiO4)3
Mineral
BROWN GRANITE (likely 'Tan Brown' or similar)
Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)
igneous
Quartz Vein in Metamorphic Rock
Quartz-veined Schist or Gneiss
metamorphic
Chert (Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper (Green Jasper/Chert)
Silicon Dioxide (SiO2)
sedimentary
Olivine (Peridot)
Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Desert Rose (Gypsum)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Copper Ore (likely Malachite or Chrysocolla staining)
Copper Secondary Mineral (e.g., Cu2CO3(OH)2)
mineral
Serpentinite (probable)
Serpentinite; chiefly serpentine-group minerals, commonly lizardite, chrysotile, or antigorite, with possible magnetite and relict olivine/pyroxene
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Jasper (likely a variety of Yellow or Mustard Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary (chemically precipitated mineral)
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Geode
Quartz / Chalcedony nodule
sedimentary