Monticellite
| Monticellite-Kirschsteinite | ||
|---|---|---|
Specific gravity 3.05 – 3.27 | | |
| Refractive index | α = 1.638 – 1.654, β = 1.646 – 1.664, γ = 1.650 – 1.674 | |
| Melting point | 1503 °C | |
| References | [2] | |
Monticellite and kirschsteinite (commonly also spelled kirschteinitemineralogist (1759–1845). Kirschsteinite is named after Egon Kirschstein, a German geologist.
Like other members of the group monticellite and kirschsteinite have
orthorhombic unit cells (space group Pbnm) shown in Figure 1. Iron and magnesium ions are located on the M1 inversion sites and calcium ions occupy the M2 site on mirror planes. The unit cell is somewhat larger than for the calcium free olivines forsterite and fayalite
with
- a = 0.4815 nm,
- b = 1.108 nm and
- c = 0.637 nm,
and for monticellite
- a = 0.4875 nm,
- b = 1.1155 nm and
- c = 0.6438 nm.
Gallery
-
The atomic scale structure of olivine looking along the a axis. Oxygen is shown in red, silicon in pink, and Mg, Fe and Ca in blue. A projection of the unit cell is shown by the black rectangle. -
Colourless crystals of kirschsteinite
References
- S2CID 235729616.
- ^ Mineralienatlas
- ^ Klein and Hurlbut Manual of Mineralogy 20th ed., p. 373
- Deer, W. A., Howie, R. A., and Zussman, J. (1992). An introduction to the rock-forming minerals (2nd ed.). Harlow: Longman ISBN 0-582-30094-0
- Mindat.org
- Webmineral.com
- Handbook of Mineralogy
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