|Crystal symmetry||Trigonal ditrigonal pyramidal
H-M symbol: (3m)
Space group: R 3c
|Unit cell||a = 10.362 Å, c = 37.106 Å; Z=6|
|Color||Colorless to white|
|Crystal habit||Occurs as anhedral grains|
|Cleavage||Poor - indistinct|
|Specific gravity||3.1 (measured)|
|Optical properties||Uniaxial (-)|
|Refractive index||nε=1.62, nω=1.623|
Discovery and naming
The mineral is named after George P. Merrill (1854-1929) of the Smithsonian Institution. Merrill had described the mineral from four meteorites in 1915: the Alfianello, Dhurmsala, Pultusk and Rich Mountain meteorites. However, the mineral was not recognized as distinct from whitlockite by the IMA until 1975.
- Merrillite data on Webmineral
- "Merrillite". Mindat. Retrieved 6 January 2013.
- Jolliff, Bradley L.; John M. Hughes, John J. Freeman and Ryan A. Zeigler (2006). "Crystal chemistry of lunar merrillite and comparison to other meteoritic and planetary suites of whitlockite and merrillite". American Mineralogist 91: 1583–1595. doi:10.2183/am.2006.2185.
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