Pyrite
Iron Sulfide (FeS2)
mineral
Category
Sedimentary Or Metamorphic Derived
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Pyrite
Iron Sulfide (FeS2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Mica Schist (with Muscovite)
Muscovite Mica Schist (KAl2(AlSi3O10)(F,OH)2)
metamorphic
Pyrite-bearing metamorphic rock (likely schist or quartzite)
Mica/quartz-rich metamorphic matrix with pyrite (FeS₂), possibly chalcopyrite (CuFeS₂)
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Mica Schist
Schist (Muscovite-Quartz Schist)
metamorphic
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
mineral
Rounded dark metamorphic pebble
Likely mica schist or chlorite-rich greenschist; exact identification requires testing
metamorphic
Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks
Polymictic gravel aggregate; dark pieces likely bitumen/asphalt, not a natural rock
sedimentary
Fuchsite Gneiss or Schist
Muscovite (variety Fuchsite) within Metamorphic Host Rock
metamorphic
Schist (Micaceous)
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Quartz Vein in Host Rock (Likely Slate or Shale)
Hydrothermal Quartz (SiO2) in Pelitic host rock
metamorphic
Red Jasper
Jasper (Silicon Dioxide, SiO2)
mineral
Unidentifiable Rock Fragment
Uncertain
Hematite
Iron(III) oxide (Fe2O3)
mineral
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Dark gray rounded river pebble
Likely basalt or fine-grained volcanic rock; exact identification requires testing
igneous
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Beach Pebbles and Quartz Aggregates
Quartz pebbles and biogenic fragments (SiO2, CaCO3)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with microscopic inclusions
mineral
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Yellow Aventurine
Quartzite with Muscovite/Goethite inclusions (SiO2)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Limonite pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O
mineral
Schist
Mica Schist
metamorphic
Weathered quartz-rich river cobble, possibly quartzite
Quartzite (mostly microcrystalline SiO₂), tentatively identified
metamorphic
Polished blue stone, likely sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed jasper or lapis lazuli
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Brown quartz-rich pebble (likely chert or weathered quartzite)
Quartz (SiO₂), possibly microcrystalline quartz/chert or quartzite
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Yellow Beryl
Beryl (Be3Al2(SiO3)6)
mineral
Quartz heart (likely milky/included quartz)
Quartz, silicon dioxide (SiO₂)
mineral