Lab+2+Rocks


 * Exercise 1: Identification of Rocks**

1. Igneous rocks are very strong and firm and are created by the cooling of magma. Sedimentary rocks are formed by the deposition of eroded rock, like the walls of the Grand Canyon; sedimentary rocks are the softest rocks. Metamorphic rocks are remelted igneous and sedimentary rocks and are harder than sedimentary but softer than igneous.

2. Number 10, Talc is a soft rock with a hardness of only 1 and is known for its greasiness and white/pearly green streak. Talc is used for paper making, plastic, rubber, and other things. Baby powder has talc and so does the powder used by athletes to keep an athlete's hands dry.

Number 1, Fluorite has a hardness of four and is known for its fluorescence and its white streak. Fluorite is used instead of glass in some very high quality telescopes. It is also used to lower the melting point of steel and is used to manufacture enamels and cooking utensils.



Number 6, Calcite has a hardness of three and has a white streak. Calcite forms the sedimentary rock of limestone, which is used for marble in many buildings in contemporary society. Calcite has been used for mortar and construction for thousands of years.




 * Exercise 2: Soil Composition**

2. Use a pipette and add 1 ml of a little soapy water to the soil sample (it is a dispersent) and fill the tube to the 45 ml line with tap water. Cap and gently shake for 2 minutes making sure that the soil sample is well mixed in. REMOVE ORGANIC MATERIAL FROM THE TOP, be sure to dump into TRASH, not in the SINK. Then **add** water to fill to the 45 ml line if there is less than 45 ml.





3. Let the tube sit for **30 seconds**, open thecap and carefully pour the solution into the second tube. Be sure not to dump the solid contents into the second tube. Let this sit for**30 minutes**.



4. Pour the solution off into the third tube and let this sit overnight.



5. b) Sand = 15 ml - amount of fluid in tube 1 15 ml - 10 ml = 5ml of sand

Silt = 15 ml - 10 ml - 2 ml Silt = 3 ml

Clay = 15 - (3+5) Clay = 7 ml
 * Type || Percent ||
 * Sand || 33.3 ||
 * Silt || 20 ||
 * Clay || 47.7 ||

Sample is Clay based on triangle chart

**Exercise 3: Fossils**

A mold is a negative image of an organism formed by a fossil. A cast is a filled mold, usually filled with minerals.

http://www.creationresearch.net/products/Fossils-Online-1/Trioblite%20cast.JPG

This is a cast because it is apparent that the trilobite has been filled on the inside with the minerals.

**Fossils: Google Amber**



http://rockhoundblog.com/wp-content/uploads/2010/08/amber.jpg

1. Amber is fossilized tree resin; it is used in perfumes, medicine and many other things; it is usually yellow but can be reddish or brownish. 2. Usually only small, soft-tissued insects or spiders are caught in amber, but sometimes larger animals are preserved in amber. 3. Hard skeletons are usually preserved in limestone, whereas small, soft-tissued animals are better preserved in amber. 4. They can be preserved for millions of years with everything intact in amber. 5. The DNA of the fossils preserved in amber is still intact, because the fossils are kept away from oxygen in an air tight seal. 6. Real amber has the ability to preserve perfectly a fossilized organism but fake amber does not because it does not have the necessary properties; there are many ways to determine if an amber sample is legitimate or not. 7. Real amber has a hardness of 2.5, fake amber is scratchable. Amber does not have a chemical smell. Amber fluoresces but fake amber does not. Amber does not sink but fake amber does. 8. I could scratch the sample with my fingernails and drop the sample in a water cup to see if it sinks or not, although that might be deemed uncourteous.