Native Elements

Native Elements

native elements
are unconfirme in Earth’s crust

Distribution
– Only carbon, in the form of graphite, constitutes significant rock-forming mineral
– other found as trace element (such as gold, silver, copper, & diamond, are rare & valuable)

Native element divided into 3 group
1. METALS
2. SEMIMETALS
3. NONMETALS

Part.1 : Metals & Semimetals

METALS
Divided into 3 group based on chemistry & structure
1. Gold group
2. Platinum group
3. Iron group

All have Isometric unit cell

bond: is strong metallic bond
– all are soft, & malleable
– all are good conductors of heat & electricity
– All are sectile, & opaque

**Structure** is ***cubic close packing*** of metal, which yields ***face-centered cubic unit cell***

**Gold Group**
*Substantial solid solution is possible between gold-silver & gold-copper*

**Gold Group**
All have *isometric unit cell*

SEMIMETALS
Bond: more covalent, directional than metals

Unit cell : Hexagonal

Occurrence: in hydrothermal sulfide deposits as primary or secondary mineral