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Earth Science: 3.2: Mineral Identification and uses
Transcript of Earth Science: 3.2: Mineral Identification and uses
Crystals form from the cooling of hot melted rock material called magma. They can also form by the evaporation of water which leaves minerals behind to form crystals. There are many different types of crystals: how do we identify them? Bellwork: Use only your notes to answer the following questions:
What is a mineral?
What are the five general characterisics of a mineral?
What are two ways that minerals form? PHYSICAL PROPERTIES Physical properties:
Cleavage/Fracture Hardness Luster Color Streak A measure of how easily a mineral can be scratched
To compare different minerals, a scale, known as the Mohs scale was developed
The scale measures the hardness of "scratching tools" (fingernail, glass, steel file), with the hardness of minerals
Each mineral is then assigned a number on the Mohs scale (see table 3-2) Luster describes how light is reflected a mineral's surface. It can be in two different types:
METALLIC: NON-METALLIC VS. Color's can be a distictive way to identify a mineral SULFUR The color of the mineral when it is powdered and broken up The way that mineral breaks is an important clue to its identification. Cleavage: minerals that break into clean layers Fracture: Minerals that break into rough jagged pieces Sometimes minerals have unique properties that identify them as well. Uses of minerals include: Ores and Gems Look through the book, and see how many different uses of minerals you can come up with. Diamonds: Formed by carbon (coal) that is pressed tightly together at a high temperature. Uses:
Talc: commonly found as a powder.
Talc is the softest of all minerals Uses:
An element Uses:
Silicate mineral Uses:
Sculpture Mineral water: