GEMSTONE LIBRARY
SPINEL
Long confused with rubies, spinels are magnesium aluminium oxide minerals. Spinels owe their colour, mainly red, pink, purple or blue, to different elements: chromium, iron or cobalt. Spinel is mined in Myanmar, Vietnam, Tajikistan, Tanzania, Sri Lanka and Madagascar.
Each spinel brought to the laboratory is analysed and identified so that the related report can be drawn up.
CHARACTERISTICS
- Name: Spinel
- Mineralogical nature: Spinel
- Colour: Red, pink, blue, green, black
- Crystal system: Cubic
- Chemical composition: MgAl2O4
- Causes of colour: Fe2+, Fe3+, Cr3+, Co2+
- Density: 3.60 to 3.90
- Hardness: 8
- Cleavage: Imperfect
- Fracture: Conchoidal
- Optic sign: Isotropic
- Refractive index: 1.711 to 1.735
- Dispersion: 0.02
- Pleochroism: Null
- UVL: Inert to weak to strong red
- UVC: Same, weaker than UVL
- Treatments: Thermal treatment
- Syntheses: Fusion
- Anhydrous dissolution
- Geographical origin: Myanmar, Vietnam, Sri Lanka, Tanzania, Tajikistan, Madagascar
INCLUSIONS
CONTACT US :
contact@lfg.paris
(+33) 01 40 26 25 45
30, rue de la Victoire - 75009 Paris
Monday - Thusday : 9H30 to 17H00
Friday : 9h30 to 16h30
Withdrawal files at same days and time
