Identification of Minerals
Do Now Which statement is best supported by the Moh’s Mineral Hardness Scale A fingernail will scratch calcite, but not quartz A fingernail will scratch quartz, but not calcite A piece of glass can be scratched by quartz, but not by calcite A piece of glass can be scratched by calcite, but not quartz.
Aim & Learning Target Aim: Learning Target: What are different mineral groups? How do we identify minerals based on the reference table? Learning Target: I can identify minerals by examining their luster, fracture, streak and hardness. I can discriminate between multiple minerals using a dichotomous key of mineral characteristics
Definition of a “Mineral” There are more than 4,000 different minerals on Earth. Some are quite common, while others are very uncommon, and we don’t use them at all. So, how do we define minerals? Mineral: a naturally occurring, nonliving solid, with a definite structure and composition. We will need to look at this definition a little more closely…
Chemical Composition Each mineral has a unique chemical composition which makes it different from all other minerals. Examples: Copper Cu Gold Au Halite NaCl Quartz SiO2 Calcite CaCO3 Corundum Al2O3 Beryl Be3Al2Si6O18 Ruby Al2O3 Diamond C
How do we Identify Them: Pg 16
What are observations that we have of table?
It tells us about Luster Hardness Cleavage/fracture Common colors Distinguishing characteristics Uses Composition name
Often on the Regents They test how well you can use the reference table.
example
Graphite use?
1. Find use part of table 2. Block out the rest of the table 3 1. Find use part of table 2. Block out the rest of the table 3. Find graphite
example
example
1. Find luster, characteristicspart of table 2. Block out the rest 3 1. Find luster, characteristicspart of table 2. Block out the rest 3. use process of elimination
example
example
1. Find hardness, dolomite 2. Look back at the problem
Answer:
Dichotomous Key Practice
Dichotomous Key Practice Mineral has: Metallic Luster, Fracture, Colored Streak, and is Hard
Dichotomous Key Practice Mineral has: Metallic Luster, Fracture, Colored Streak, and is Hard
Dichotomous Key Practice Mineral has: Non-metallic Luster, cleavage, colored streak, soft __________
Dichotomous Key Practice Mineral has Non-metallic luster, fracture, white streak, hard Mineral has: Non-metallic Luster, cleavage, colored streak, soft __________
Classwork: Textbook: Pages 50 – 54 Define the Vocabulary Listed on Page 50 Complete the Reading strategy listed on Page 50