Presentation is loading. Please wait.

Presentation is loading. Please wait.

Minerals Naturally occurring 2. Inorganic

Similar presentations

Presentation on theme: "Minerals Naturally occurring 2. Inorganic"— Presentation transcript:

1 Minerals Naturally occurring 2. Inorganic
3. Solid - crystalline (orderly) structure. -- Can be elements or compounds.

2 Minerals Over 4,500 minerals identified. About 100 are common.
Only about 10 elements make up most minerals. Silicon and oxygen are majority.

3 Identification Luster: Is it metallic (shiny) or non-metallic (dull)?
Hardness (Moh’s Scale): Resistance to scratching. *Based on internal arrangement of atoms. *Use glass plate to test for hardness

4 Hardness of Common Objects
Fingernail = 2.5 Penny = 3.5 Glass = Streak Plate = 7.0

5 ID Continued Cleavage / Fracture: How the mineral breaks.
Cleavage = mineral always breaks with a flat side. Fracture = no smooth break; but some are distinctive. Ex. Conchoidal, fibrous, uneven.

6 More ID Streak: color left after rubbing mineral on streak plate (usually porcelain). Chemical Composition: in the laboratory. Color: least reliable. WHY? Minerals may occur in many different colors.

7 Last ID Special Properties: Magnetism Luminescence - radiation
Piezoelectricity - electricity when pressure is applied (quartz). Double Refraction - Calcite

8 Crystal Structure Most abundant elements in Earth’s crust = silicon and oxygen. Silicon and oxygen form tight bond = Tetrahedron (4 O Si) Silicon can form with other elements to form rings, sheets, and frameworks.


Download ppt "Minerals Naturally occurring 2. Inorganic"

Similar presentations

Ads by Google