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Rhyodacite
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Rhyodacite is a volcanic rock intermediate in composition between dacite and rhyolite. It is the extrusive equivalent of those plutonic rocks that are intermediate in composition between monzogranite
A sample of rhyodacite from Slovakia
A sample of rhyodacite from Slovakia
Rhyodacite pumice from the late August 1883 eruption of Krakatoa. This rock floated across the Indian Ocean for almost a year before it washed ashore
Rhyodacite pumice from the late August 1883 eruption of Krakatoa. This rock floated across the Indian Ocean for almost a year before it washed ashore at Takwa Beach, Kenya, East Africa.
Mafic
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Mafic is a term used in geology to describe silicate minerals, magmas, and igneous rocks that are rich in magnesium and iron, while being relatively low in silica content. Most mafic minerals are dark
Basalt
Basalt
Apatite
Apatite
An ʻaʻā flow from Mauna Loa (a volcano in Hawaii), composed of mafic magma.
An ʻaʻā flow from Mauna Loa (a volcano in Hawaii), composed of mafic magma.