Pink Granite
Phaneritic Quartz-Feldspar Plutonic Rock
igneous
Category
Mineral, Specifically A Detrital Grain
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Likely weathered quartz-rich rock fragment
Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock
igneous
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Rose Quartz
Silicon dioxide with traces of titanium, iron, or manganese (SiO2)
mineral
Pink Granite
Granite (Phaneritic igneous rock)
igneous
Quartzite (specifically Pink or Red Quartzite)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Railway Ballast (Crushed Traprock / Basalt with Iron Oxide Staining)
Mafic Volcanic Rock (Basalt / Diabase with Fe2O3.nH2O limonite coatings)
igneous
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineralological
Dalmatian Jasper
Peralkaline Feldspar Diorite/Rhyolite
igneous
Rounded gray pebble
Indeterminate; likely a water-worn silicate or carbonate pebble
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (River Cobble)
Arenite
sedimentary
Chert (specifically Jaspery Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Pegmatitic granite specimen
Granitic pegmatite, chiefly quartz (SiO₂), feldspar, and mica
igneous
Crushed Granite Gravel
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Dark, coarse-grained rock (possibly mafic igneous rock)
Undetermined; potentially basaltic or gabbroic material
igneous
Moonstone
Orthoclase (KAlSi3O8), specifically the variety showing adularescence
mineral
Moqui Marble
Hematite-Goethite Concretion
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone and Quartzite Specimens
SiO2 with varying mineral/clastic inclusions
sedimentary/metamorphic
Mixed Quartz Bracelet (Rose Quartz and Larimar-colored beads)
Silicon Dioxide (SiO2) with various inclusions
mineral
Jasper (Petrified Wood variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Mineral alternative / Synthetic
Tiny amber-colored crystal fragment
Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral
mineral
Sandstone (Ferruginous)
Arenite with Iron-Oxide cement
sedimentary
Peridot
Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)
Mineral
Pink Granite
Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Quartz (likely Rose Quartz or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)
igneous
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2)
igneous
Stromatolite fossil in Chert/Jasper
Cyanobacteria / Microcystis (fossilized)
fossil
Green Aventurine
Silicon Dioxide (Quartz) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Yellow Quartz (Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Banded Carnelian
Carnelian (Silicon Dioxide / SiO2)
mineral