User:Bakerme2/Garnet

There are a few things I want to change about this page.

First I want to add the names for the garnet groups in the introduction. The article as is mentions two solid solution groups and I want to add that they are called pyralspite and ugrandite. I also want to add the origin of the name garnet (from Latin word granatus, meaning "like a grain")

Second I want to edit the physical properties section to include citations. I also want to add that older texts will use the AB system rather than the XY. I want to say they" do not have any cleavage planes" rather than that they "do not show cleavage". I want to add they they can be in the hexoctahedral habit as well and they are never cubic despite being isometric because the {100} and {111} families of planes are depleted. I want to add citations for hardness. I also want to add that the ugrandite group sometimes has weak birefringence and low order colors.

Garnet group End member species I want to change the heading so that endmember is end member.

I want to add the origin of pyrope (derived from the Greek word for firelike)

I want to change the geologic origin section for andradite and add the name origin.

I want to add that grossular is found in skarns and formed by contact metamorphism.

I want to add that uvarovite is the rarest end member of garnet and is named after Count Uvaro, a Russain imperial statesman.

Lastly I want to rewrite the Geological Significance Section but include some of what was already written

The mineral garnet is commonly found in metamorphic and to a lesser extent, igneous rocks. Most natural garnets are compositionally zoned and contain inclusions. Its crystal lattice structure is stable at high pressures and temperatures and is thus found in green-schist facies metamorphic rocks including gneiss, hornblende schist, and mica schist. The composition that is stable at the pressure and temperature conditions of Earth's mantle is pyrope, which is often found in peridotites and kimberlites, as well as the serpentines that form from them. Garnets are unique in that they can record the pressures and temperatures of peak metamorphism and are used as geobarometers and geothermometers in the study of geothermobarometry which determines "P-T Paths", Pressure-Temperature Paths. Garnets are used as an index mineral in the delineation of isograds in metamorphic rocks. Compositional zoning and inclusions can mark the change from growth of the crystals at low temperatures to higher temperatures. Garnets that are not compositionally zoned more than likely experienced ultra high tempertures (above 700 °C) that led to diffusion of major elements within the crystal lattice, effectively homogenizing the crystal or they were never zoned. Garnets can also form metamorphic textures that can help interpret structural histories.

In addition to being used to devolve conditions of metamorphism, garnets can be used to date certain geologic events. Garnet has been developed as a U-Pb geochronometer, to date the age of crystallization as well as a thermochronometer in the (U-Th)/He system to date time of cooling below a closure temperature.

Garnets can be chemically altered and most often alter to serpentine, talc, and chlorite.

Industrial Uses:

I want to add the significance of the Gore Mountain Garnet and its use as an industrial abrasive.