Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
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.
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive)
igneous
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Chert / River Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Rose Quartz with Hematite inclusions
Crystalline Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Diamond Plate (Steel)
Alloyed Carbon Steel or Aluminum with 'Durbar' pattern
not a rock (Man-made industrial metal)
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Microcrystalline/Macro crystalline variety)
Silicon Dioxide (SiO2)
mineral
Chert (Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Mixed Quartz Bracelet (Rose Quartz and Larimar-colored beads)
Silicon Dioxide (SiO2) with various inclusions
mineral
Chlorite (Small Flakes/Sand)
Chlorite Group (Magnesium Iron Aluminum Silicate Hydroxide - (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or iron oxide inclusions
sedimentary
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Mica (specimen appears to be Muscovite or Phlogopite)
Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2
Mineral (Found in Igneous and Metamorphic rocks)
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Quartz (small fragment)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz / Quartzite)
Silicon Dioxide (SiO2)
mineral
Red Jasper (Chert)
Silicon Dioxide (SiO2) with impure Iron Oxides
sedimentary
Titanium Quartz (Rough)
Titanium-included Silicon Dioxide (SiO2 + Ti)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Pyrite (Fool's Gold) in Matrix
Iron Sulfide (FeS2)
mineral
Quartz (Quarzite or Massive Quartz vein)
Silicon Dioxide (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Chert with Limestone matrix
Microcrystalline silica (SiO2) in Calcite (CaCO3) matrix
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite mica)
mineral
Yellow Quartzite (River Pebble)
Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
Jasper (likely river-worn)
Silicon Dioxide (SiO2)
sedimentary
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions
sedimentary
Agate (Moss or Plume Agate variety)
Silicon Dioxide (SiO2)
mineral
Chert (Common Opal/Jasper transition)
Silicon Dioxide (SiO2)
sedimentary