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Description: Fluorite often forms coarse cleavable masses or cubic crystals. It can take on a range of attractive colors, most often purple. Fluorite occurs in all types of hydrothermal deposits. It also forms as an accessory in igneous rocks, especially syenites and granite pegmatites. In Wisconsin, most fluorite localities are in the Wausau area, associated with the Wausau and Stettin plutons.
Diorite is a coarse-grained igneous rock that forms when the magma did not erupt, but instead slowly crystallized within Earth's crust. Andesite is a fine-grained rock that formed when the magma erupted onto the surface and crystallized quickly. Andesite and diorite have a composition that is intermediate between basalt and granite. This is because their parent magmas formed from the partial melting of a basaltic oceanic plate. This magma may have received a granitic contribution by melting granitic rocks as it ascended or mixed with granitic magma. Andesite derives its name from the Andes Mountains of South America. In the Andes it occurs as lava flows interbedded with ash and tuff deposits on the steep flanks of stratovolcanoes.