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My name means "peace" and my birthstone is supposed to "induce a peaceful sleep". Hmmm.

Behind Birthstones

My name means "peace" and my birthstone is supposed to "induce a peaceful sleep". Hmmm.

Feldspar - Arkose is a feldspar rich sandstone.

Feldspar - Arkose is a feldspar rich sandstone.

The Quartz Page: Quartz as a Rock-Forming Mineral - Gabbro - an intrusive igneous rock. The rock is coarse grained, just as a granite, but much darker with a conspicuous greenish color. normally white color of fresh plagioclase has turned into a gray-green because of chemical alterations, and the rock also contains some biotite that has been formed by weathering of fayalite, an iron-rich olvine.

The Quartz Page: Quartz as a Rock-Forming Mineral - Gabbro - an intrusive igneous rock. The rock is coarse grained, just as a granite, but much darker with a conspicuous greenish color. normally white color of fresh plagioclase has turned into a gray-green because of chemical alterations, and the rock also contains some biotite that has been formed by weathering of fayalite, an iron-rich olvine.

The Quartz Page: Quartz as a Rock-Forming Mineral - dark mineral is mostly biotite, the bright components are feldspar and little quartz.

The Quartz Page: Quartz as a Rock-Forming Mineral - dark mineral is mostly biotite, the bright components are feldspar and little quartz.

Larvikite

Larvikite

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