What is the chemical composition of blue sapphire?
Table of Contents
- 1 What is the chemical composition of blue sapphire?
- 2 What are the chemical properties of sapphire?
- 3 What is the physical and chemical properties of sapphire?
- 4 Is sapphire a compound?
- 5 What are the five properties of a sapphire?
- 6 How is sapphire formed?
- 7 How yellow sapphire is formed?
- 8 What are facts about Sapphire?
- 9 What are the characteristics of Sapphire?
What is the chemical composition of blue sapphire?
Blue Sapphire – Neelam
| Chemical Composition | ||
|---|---|---|
| Chemical Formula | Al2O3 | 9 |
| Specific Gravity | 3.9-4.1 | 1.76 – 1.77 |
What are the chemical properties of sapphire?
Main properties of sapphire:
| Chemical formula | Al2O3 |
|---|---|
| Density, g/cm3 | 3.98 |
| Melting point, °K | 2303 |
| Hardness | Knoop(daN/mm2): 1800 parallel to C-axis, 2200 perpendicular to C-axis, Mohs: 9 |
| Optical transmission range, µm | 0.17 – 5.5 |
What is the physical and chemical properties of sapphire?
Density: 3.98 g/cm3, (0.143 lbs./in3) Hardness: Knoop microindenter: 1800 FACE perpendicular to c-axis, 2200 FACE parallel to c-axis. Young’s Modulus: 400 GPa @ 20°C. Tensile Strength: 300 to 400 MPa.
How sapphires are formed?
Corundum is found in igneous rocks. When those are cooling slowly, large crystals of minerals can form from those that are present within the magma. The purest sapphires are formed during the transformation of igneous rocks. The more slowly the magma cools, the larger the sapphires will be.
Is a sapphire a diamond?
A sapphire is a mineral but it is not diamond even though a diamond is a mineral as well. They are both different types of minerals. Sapphires are a variety of the mineral corundum,which is an aluminum oxide. Various elements found within the sapphires cause different hues.
Is sapphire a compound?
Sapphires are composed almost entirely of the colorless ionic compound aluminum oxide (Al2O3), which is sometimes referred to by the older name corundum.
What are the five properties of a sapphire?
The advantages of sapphire include:
- Excellent optical characteristics, UV to IR.
- High wear and scratch resistance.
- High operating temperature (1800°C)
- Chemically inert.
- High strength.
- High electrical resistance.
- High thermal conductivity.
How is sapphire formed?
Can sapphire conduct electricity?
Insulators. Crystals of quartz (silicon dioxide) and sapphire (aluminum oxide), to name two very good insulators, have large band gaps (both around 8 electron volts, or “ev”), so they do not conduct electricity at room temperature, for the same reason that pure silicon does not.
Is sapphire igneous metamorphic or sedimentary?
Gems from metamorphic rocks include popular faceted crystal varieties: corundum (including ruby and sapphires), beryls (including emeralds), garnet, spinel, and zircon.
How yellow sapphire is formed?
How Are Yellow Sapphires Formed. Yellow sapphire comes from the corundum mineral and develops its unique color from the presence of iron during formation. Over the course of millions of years, traces of iron can color the corundum that makes up the sapphire, giving it a warm, yellow color.
What are facts about Sapphire?
Interesting Facts about Sapphires are as follows: Fact 1 – Definition: Sapphires are blue transparent variety of corundum, highly prized as gemstones. Fact 2 – The origin of the name Sapphire is derived from the Greek word “sappheiros” which means “precious stone” Fact 3 – The most common color of Sapphires is blue.
What are the characteristics of Sapphire?
Hardness (9 Mohs std): 2000 kg/mm2,Knoop
What is the crystal structure of Sapphire?
Crystal Structure of Sapphire. Sapphire is an anisotropic, rhombohedral crystal form of Aluminum Oxide. Anisotropic single crystal materials exhibit some properties such as thermal expansion and hardness which vary significantly by orientation. For most applications this is unimportant, however it should be considered.
Is Sapphire a mineral?
Sapphires are in the non-red corundum category of minerals and are considered the second hardest mineral on the Mohs scale . Sapphires are aluminum oxides that can be found naturally or can be manufactured.