We spent the afternoon testing the rocks in our collections trying to classify them and determine their hardness.
We did scratch testing and referred to Moh's hardness scale to determine how hard our rocks and minerals were. We did streak test to figure out the mineral colours in our rocks and we did an acid test to find out if our rocks would fizz (meaning they may contain the minerals dolomite or calcite). It was a fun afternoon.
|Scratching with a penny|
|Acid test (Vinegar)|
|Scratching Soap stone, 1-2 on the hardness scale.|