Specimens

ANDESITE | Andesite features abundant phenocrysts in a fine grained matrix, and offers a great demonstration of igneous porphyry GREAT FOR GEOLOGY...

PERIDOTITE | Peridotite is an iron-rich ultramafic rock, with a chemistry that suggests genesis from a point deep within the crust, possibly as de...

PINK GRANITE | Commonly found as magmatic intrusions in the crust, granite forms slowly in shallow or evolved magma chambers. The large crystals a...

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

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

ANDESITE | Andesite features abundant phenocrysts in a fine grained matrix, and offers a great demonstration of igneous porphyry GREAT FOR GEOLOGY...

PERIDOTITE | Peridotite is an iron-rich ultramafic rock, with a chemistry that suggests genesis from a point deep within the crust, possibly as de...

PINK GRANITE | Commonly found as magmatic intrusions in the crust, granite forms slowly in shallow or evolved magma chambers. The large crystals a...

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

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