Not A Rock Or Mineral

Dendritic Agate

Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)

Mixed gemstone jewelry collection

Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline

Quartz Geode Segment

Crystalline Silicon Dioxide (SiO2)

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Milky Quartz

Silicon Dioxide (SiO2)

Polished moss agate (likely dendritic agate)

Chalcedony, microcrystalline quartz (SiO₂), with inclusions of manganese/iron oxides or hornblende

Milky Quartz

Silicon Dioxide (SiO2)

Weathered quartz-rich pebble

Likely quartzite or granitic/granodioritic rock; exact identification is uncertain from the image

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)

Honey calcite (calcite-rich limestone/marble fragment)

Calcite — CaCO₃; likely coarse crystalline calcitic rock

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Grass (Organic Matter/Soil)

Poaceae (family of monocotyledonous flowering plants)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (chemical formula: C10H16O)

Veined Pebble (Septarian or Quartz-Veined Chert/Basalt)

Silicon Dioxide (SiO2) veins in matrix

Weathered iron-rich quartzite or sandstone pebble

Ferruginous quartzite; primarily quartz (SiO₂) with iron-oxide coatings

Veined Limestone

Sedimentary Calcite-Veined Rock (CaCO3)

Basalt with Quartz Veins

Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions

Microcline Feldspar (Amazonite or White Feldspar)

KAlSi3O8

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Tumbled serpentine

Serpentine-group minerals, chiefly lizardite and antigorite; approximate formula Mg₃Si₂O₅(OH)₄

Chert with Calcite Veining

Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins

Quartz-veined Limestone

Sedimentary limestone with hydrothermal quartz/calcite veins (CaCO3 / SiO2)

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Epidote

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Transit Token (RTD Denver)

Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)

Pegmatite

Granitic Pegmatite

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Amygdaloidal Basalt

Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)

Biotite Schist

Biotite Schist (Rich in K(Mg,Fe)3AlSi3O10(OH)2)

Biotite Mica

Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Smelter Slag

Anthropogenic Silicate Slag

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Amygdaloidal Basalt

Amygdaloidal Basalt (with Epidote and Feldspar/Zeolite infill)

Muscovite Mica

Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2

Puddingstone

Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)