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RHYOLITE | Rhyolite is an aphanitic felsic rock which forms during eruptions of thick, viscous magma. Often containing phenocrysts of felsic miner...

SCORIA | Scoria forms as spatter from bubbly, mafic lava is thrown into the air and cooled quickly. The crystallization happens so quickly that la...

SERPENTINITE | When clay- and aluminum-rich rock is altered by water from geothermal systems, serpentinite is liable to form. Often found in low-g...

SOAPSTONE | Through the process of metasomatism, hot fluid infiltrates the atomic structure of other silicate minerals, altering them to form soap...

SULFUR | Sulfur is a popular mineral that forms as a soft precipitate near volcanic vents and springs. This bright yellow mineral has a distinct s...

SULFUR | Sulfur is a popular mineral that forms as a soft precipitate near volcanic vents and springs. This bright yellow mineral has a distinct s...

TRAVERTINE | & classification exercises. Travertine is a carbonate rock formed from gushing hot springs. The airy, porous material indicates a...

VOLCANIC TUFF | Dust & ash deposited during explosive volcanic eruptions can become compacted and lithified over time, forming large packages ...

VOLCANIC TUFF | Dust & ash deposited during explosive volcanic eruptions can become compacted and lithified over time, forming large packages ...

WHITE SANDSTONE | White Sandstone is a recognizable sedimentary rock made up of well sorted and rounded grains of quartz, indicating that the clas...

WHITE SANDSTONE | White Sandstone is a recognizable sedimentary rock made up of well sorted and rounded grains of quartz, indicating that the clas...

Calcite septarian plate approximately 8" in diameter Septarian nodules have a carbonate center surrounded by cemented sediments of sand and mud Th...

SLATE | Slate is the result of the compression of shale, but is denser and retains the fissile properties, making for an interesting exercise when...

UNGLAZED STREAK PLATE || Single, unglazed porcelain streak plate. Off-white color 50MM X 50MM || Plate measures 1.9" (50mm) long and wide, and is...

WHITE QUARTZITE | Quartzite is formed from sandstone that has been tightly compressed to the point where the clasts have recrystallized to form a ...