leucogranite - an orogenic collision-related rock - student unit of 5 specimens

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Leucogranite - a rock associated with collisional orogenic zones. Unit of 5 student specimens
Leucogranite is a characteristic feature of collisional orogenic zones. It is a light-colored granitic rock composed of quartz, plagioclase feldspar with almost no dark minerals. In this Proterozoic leucogranite, from a dike in the Beaver Dam Mountains of Utah, large garnet crystals are common.
Leucogranite forms by the melting of metamorphosed fine-grained sedimentary rocks in the upper portions of thickened crust. In the western United States, the presence of leucogranite suggests the possible locations of collisional suture zones for Precambrian terranes accreted to Laurentia.
Mont Saint-Michel in Normandy, France, is composed of leucogranite, emplaced during the Cambrian, about 525 million years ago. Leucogranite in the Black Hills is related to the Proterozoic Trans-Hudson orogeny. Leucogranites are associated with the Blue Ridge basement complex and in Maine, the Paleozoic Appalachian orogeny.
The name is derived from the Greek,
leukos
, for white.
We really don't like the tiny finger nail-sized specimens offered to students, as we feel these are too small to see rock textures and too small for examining the identifying characteristics of a mineral. We want the "Oh, Wow!" effect when students see the set of specimens they are going to work with. We collect these specimens so that five specimens, or possibly six, will fit in a small flat rate box, and we keep the price low, as we know these will be used in a classroom. For teachers we count like a baker and a dozen is more than 12, since you will always need a few spares.  If you are a teacher, let us know.
You are buying a unit of five student specimens. The photo is representative of what we ship.
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