Micheelsenite, (Ca,Y)(3)Al(PO3OH,CO3)(CO3)(OH)(6)*12H(2)O, a new mineral from Mont Saint-Hilaire, Quebec, Canada and teh Nanna pegmatite, Narsaarsuup Qaava, South Greenland
- Author(s)
- A M McDonald, Ole V Petersen, R A Gault, O Johnsen, Gerhard Niedermayr, Franz Brandstätter, Gerald Giester
- Abstract
Micheelsenite, a new member of the ettringite group, is found in pegmatites, so-called silicate cavities, seams in hornfels and marble xenoliths at the Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada and at the Nanna pegmatite, Narsaarsuup Qaava, South Greenland. It occurs as acicular to fibrous crystals in loosely packed radiating groups and as matted fibres. At Mont Saint-Hilaire, the mineral occurs in association with aegirine, albite, ancylite-(Ce), catapleiite, fluorite, microcline, monteregianite-(Y), natrolite, nenadkevichite, rhodochrosite and seŽrandite (pegmatites) or natrolite, titanite, calcite and pyrite (seams in hornfels). At the Nanna pegmatite the mineral occurs with aegirine, astrophyllite, analcime, calcio-ancylite-(Ce), catapleiite, fluorite, galena, gibbsite, leucophanite, microcline, natrolite, nafertisite, orthoclase, polylithionite, sodalite var. hackmanite and todorokite. The mineral is colorless to white, transparent to opaque with a vitreous luster. It has a hardness of 3 1/2-4, is brittle with a splintery fracture and has good {1010} and {0001} cleavages. It is uniaxial negative with ? = 1.532(1) and e = 1.503(1) (Mont Saint-Hilaire), ? = 1.5265(5) and e = 1.5020(5) (Nanna pegmatite) and is non-pleochroic. Dmeas. 2.15(1) and Dcalc. 2.17(1)g/cm3. The mineral is hexagonal, P63 with a 10.828(3), c 10.516(4) A°, V = 1067.8(5) A°3 (Mont Saint-Hilaire), a 10.864(4), c 10.539(4) A°, V = 1077.2(5) A°3 (Nanna pegmatite) with Z = 2. The strongest lines on the X-ray powder diffraction pattern [d in A° (I)(hkl)] are: 9.38(100)(100),.
- Organisation(s)
- Department of Mineralogy and Crystallography
- External organisation(s)
- Laurentian University, Geologisk Museum, Canadian Museum of Nature
- Journal
- Neues Jahrbuch für Mineralogie. Monatshefte
- Volume
- 8
- Pages
- 337-351
- No. of pages
- 15
- ISSN
- 0028-3649
- Publication date
- 2001
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 1051 Geology, Mineralogy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/96607b27-976f-4fa4-9b52-b4b5af5754aa