What is it?
Galena is a grayish-black mineral consisting of lead sulfide and silver. it is the chief ore of lead.
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Characteristics of a mineral
These are some of the characteristics of Galena.
1. Color- grayish black
2. Streak- grayish black
3. Luster- metallic and earthy
4. Density- 7.6gm/cm3
5. Hardness- 2.5-3
6. Crystal System- isometric/cubic
7. Cleavage- fine/perfect
1. Color- grayish black
2. Streak- grayish black
3. Luster- metallic and earthy
4. Density- 7.6gm/cm3
5. Hardness- 2.5-3
6. Crystal System- isometric/cubic
7. Cleavage- fine/perfect
Definition Of A Mineral
The definition of a mineral is a naturally occurring, inorganic solid, that has a crystal structure and a definite chemical composition. All minerals have characteristics and properties that identify it.
How Does Galena Fit the Definition Of A Mineral?
Galena fits the definition of a mineral because it is a naturally occurring, inorganic solid, that has a crystal structure and a definite chemical composition.
How Is Galena Formed?
According to "http://www.australianminesatlas.gov.au/" "The main lead mineral is galena (PbS), which contains 86.6% lead. Cerussite (PbCO3) and angle site (PbSO4) commonly occur in the near-surface weathered or oxidized zone of a lead ore body. Deposits containing lead form from hot (hydro thermal) fluids generated within the earth which may be trapped below the surface in cracks where galena and other minerals may precipitate to make vein deposits."
This means that the hot water in the Earth gets trapped in cracks and the galena "precipitates" out.
This means that the hot water in the Earth gets trapped in cracks and the galena "precipitates" out.
Special Property's
Galena has a perfect cleavage. This means that the area were it split in to two pieces is extremely smooth and fine.