|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. The mineral was not recognized as distinct from whitlockite, however, by the IMA until 1975.
- Merrillite data on Webmineral
- "Merrillite". Mindat. Retrieved 6 January 2013.
- Jolliff, Bradley L.; John M. Hughes; John J. Freeman & 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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