MINERALOGY OF LONG ISLAND'S GLACIAL LEGACY
Thanks to glacial deposition, Long Island is an area that contains a
wide variety of rock types. A large percentage of these rocks are
foliated metamorphic and intrusive igneous boulders. Due to their
environments of formation, these types of rocks display coarse textures
and are ideal for mineral collecting.
STEP 1
Find a location where there is a concentration of boulders. Using a
hammer (and observing the safety rules of collecting below) search for
and break off samples of ten different minerals. The coarser the rock’s
texture, the easier this will be. The use of a hand lens in the field may
be helpful.
STEP II
Using standard mineral identification tests and a mineral identification
chart (found in most geology books), identify your samples. YOUR
IDENTIFICATION WILL BE CARRIED OUT AFTERSCHOOL ON
DESIGNATED DAYS IN ROOM 230. Record your test results on a
data table. (You must test for STREAK, HARDNESS, AND LUSTER.
You may do additional tests you feel necessary to correctly identify the minerals)
STEP III
Your mineral samples will be small pieces chipped from a rock. As a
result, they can easily be displayed in an empty egg carton. Be sure
each sample or compartment is clearly labeled. INCLUDED WITH
YOUR SAMPLES MUST BE YOUR TYPED DATA TABLE
CONTAINING YOUR TEST RESULTS.
NOTE: If the sample is polymineralic, you must be absolutely clear in
defining the spot I am to test.
SAFETY RULES OF COLLECTING
1-Hammering rocks can be dangerous, be carefull
2-Always wear safety goggles, long pants, long sleeves, and gloves
3-Make sure no one is standing nearby
4-Cover the rock with an old rag or towel to prevent loose chips from hitting you
5-Always hammer under adult supervision
RETURN TO HOMEPAGE