The black granite known as "Black Academy" comes from the Academy pluton, a 'granite' igneous intrusion at the western edge of the Sierra Nevada mountains. The dark gray to black granite at Academy was formed by magma slowly crystallizing as it cooled below the surface of the Earth. While stone from Academy has long been known as 'black granite' in the commercial stone trade, geologically speaking the black stone from the Academy formation is actually a mafic stone and not a true granite. Academy granite is not a true 'black granite' but a gabbro. Gabbros similar to those from Academy cover about 60% of the earth's surface, mostly under the seafloors. The earth constantly produces new gabbro rocks similar to black Academy granite. These black and grey gabbros form in an ongoing geological recycling process that has replaced the entire ocean floor over the last 180 million years.
The black granite known as "Black Academy" comes from the Academy pluton, a 'granite' igneous intrusion at the western edge of the Sierra Nevada mountains. The dark gray to black granite at Academy was formed by magma slowly crystallizing as it cooled below the surface of the Earth. While stone from Academy has long been known as 'black granite' in the commercial stone trade, geologically speaking the black stone from the Academy formation is actually a mafic stone and not a true granite. Academy granite is not a true 'black granite' but a gabbro. Gabbros similar to those from Academy cover about 60% of the earth's surface, mostly under the seafloors. The earth constantly produces new gabbro rocks similar to black Academy granite. These black and grey gabbros form in an ongoing geological recycling process that has replaced the entire ocean floor over the last 180 million years.
The black granite known as "Black Academy" comes from the Academy pluton, a 'granite' igneous intrusion at the western edge of the Sierra Nevada mountains. The dark gray to black granite at Academy was formed by magma slowly crystallizing as it cooled below the surface of the Earth. While stone from Academy has long been known as 'black granite' in the commercial stone trade, geologically speaking the black stone from the Academy formation is actually a mafic stone and not a true granite. Academy granite is not a true 'black granite' but a gabbro. Gabbros similar to those from Academy cover about 60% of the earth's surface, mostly under the seafloors. The earth constantly produces new gabbro rocks similar to black Academy granite. These black and grey gabbros form in an ongoing geological recycling process that has replaced the entire ocean floor over the last 180 million years.
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