My Igneous Rock! Lab #4

Diorite

• intermediate composition between felsic and mafic
• classically a salt and pepper rock
• white to light gray plagioclase and black hornblende
• some diorites contain biotite as well as hornblende, and some contain up to 10% quartz
• If you have more than 10% quartz, you probably have a granite on your hands. If you clearly have abundant K-feldspar, you probably have a granite on your hands. 
• Diorite occurs in small bodies such as sills, dikes, stocks, or as more irregular masses associated with gabbro and batholiths of granodiorite and granite.

Lab #3, My Minerals

Gypsum is found in nature in mineral and rock form. As a mineral, it can form very pretty, and sometimes extremely large, crystals.

Pumice is a type of extrusive volcanic rock, produced when lava with a very high content of water and gases is extruded from a volcano

Amethyst is a violet variety of quartz

Galena, highly reflective and commonly in cubes.

Halite is the native salt, occurring in massive, granular, compact, or cubic-crystalline forms.

Feldspar, found in abundance on Earth's crust.

 

 

 

Amphibole, a variety of hornblende from Faraday Township, Ontario, Canada.
Specimen is approximately 3 inches across.

Lab #2, Maps

Proportional Symbol Map

Dot Density Map

Isarithmic Map

Choropleth Map

My Isarithmic Map