Minerals

Topics: Mineralogy, Chemistry, Crystal Pages: 2 (358 words) Published: December 4, 2012
A mineral is any naturally occurring, inorganic substance, often additionally characterized by an exact crystal structure. Its chemical structure can be exact, or can vary within limits. Minerals possess a number of properties that are used as an aid in their identification just like color, luster, streak, cleavage, hardness, specific gravity, and even by their chemical properties, composition, Hardness, Crystal Form, Electrical Properties and Melting Points. Here I got a mineral as shown in the fig 1.1 I run different physical and chemical test to identify it.

Figure 1.1 TRONA
By running different physical and chemical tests I identified this mineral as TRONA. Chemistry: Na3(HCO3)(CO3) - 2H2O , Hydrated Sodium Bicarbonate Carbonate. Class: Carbonates I have listed the physical and chemical evidence which I have tested in the lab using the provided facilities. Physical evidence:

1. Color: I observed that it is gray, colorless, white, pale brown or yellowish. 2. Luster: the luster is vitreous.
3. Transparency: it’s crystals are transparent to translucent. 4. Crystal System: it is monoclinic; 2/m.
5. Crystal Habits: include prismatic to blocky crystals, but usually massive, fibrous or columnar. 6. Cleavage: is perfect in one direction and poor in two others. 7. Fracture: is subconchoidal to uneven.

8. Hardness: is 2.5 - 3.
9. Specific Gravity: is 2.1 (well below average)
10. Streak: is white.
Calculated evidence of Trona:
1. Electron Density: Bulk Density (Electron Density)=2.15 gm/cc note: Specific Gravity of Trona =2.13 gm/cc. 2. Fermion Index: Fermion Index = 0.0014442381 Boson Index = 0.9985557619 3. Photoelectric: PETrona = 0.67 barns/electron U=PETrona x rElectron Density= 1.45 barns/cc. 4. Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units) Trona is Not Radioactive Optical evidence of Trona:

1. Gladstone-Dale: CI meas=...
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