rocks & minerals li chung ming, pavel zinin ruth jia & tayro acousta amazing minerals
Post on 22-Dec-2015
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4 important elements for a mineral
Naturally-occurring Inorganic SolidFixed Chemical CompositionCrystalline
Diamond is crystalline with a fixed chemical composition -- carbon (C)
A single crystal with awell-developed external form The unit cell of diamond
structure showing how carbon atoms inside are arranged.
There are about 3000 known minerals so far.
Only 200 of them are commonly observed.
20 of them are important rock-forming minerals.
1. Diamond
The mineral we eat daily –table salt NaCl (halite)
Na+1 Cl-1
The mineral halite has a typical ionic bonding between Na+1 and Cl-1
The unit cell is face-center cubic
The yellow mineral that fools many people as gold
The cubic crystalof pyrite
Crystal structure – a face-center cubic
pyrite(FeS2 )
Interesting features of pyrite, FeS2
The black color for pyrite powder
Clear striations on the surface
The simplest way to produce powder from minerals is to scratch a sharp edge of a specimen against a rough & hard ceramic plate. You may try a pyrite specimen on the table to see if it is correct.
Interesting facts about the olivine mineral
It is the major component for the green sand.
It is the first mineral crystallized out from the molten magma.
Puu Mahana, Green Sand Beach, Hawaii
olivine crystals in the basalt