| Reference Type | Journal (article/letter/editorial) |
|---|
| Title | Angastonite, CaMgAl2(PO4)2(OH)4·7H2O: a new phosphate mineral from Angaston, South Australia |
|---|
| Journal | Mineralogical Magazine |
|---|
| Authors | Mills, S. J. | Author |
|---|
| Groat, L. A. | Author |
| Wilson, S. A. | Author |
| Birch, W. D. | Author |
| Whitfield, P. S. | Author |
| Raudsepp, M. | Author |
| Year | 2008 (October) | Volume | 72 |
|---|
| Issue | 5 |
|---|
| Publisher | Mineralogical Society |
|---|
| Download URL | https://rruff.info/rruff_1.0/uploads/MM72_1011.pdf+ |
|---|
| DOI | doi:10.1180/minmag.2008.072.5.1011Search in ResearchGate |
|---|
| Generate Citation Formats |
|---|
| Classification | Not set | LoC | Not set |
|---|
| Mindat Ref. ID | 243943 | Long-form Identifier | mindat:1:5:243943:7 |
|---|
|
| GUID | 0 |
|---|
| Full Reference | Mills, S. J., Groat, L. A., Wilson, S. A., Birch, W. D., Whitfield, P. S., Raudsepp, M. (2008) Angastonite, CaMgAl2(PO4)2(OH)4·7H2O: a new phosphate mineral from Angaston, South Australia. Mineralogical Magazine, 72 (5) 1011-1020 doi:10.1180/minmag.2008.072.5.1011 |
|---|
| Plain Text | Mills, S. J., Groat, L. A., Wilson, S. A., Birch, W. D., Whitfield, P. S., Raudsepp, M. (2008) Angastonite, CaMgAl2(PO4)2(OH)4·7H2O: a new phosphate mineral from Angaston, South Australia. Mineralogical Magazine, 72 (5) 1011-1020 doi:10.1180/minmag.2008.072.5.1011 |
|---|
| Abstract/Notes | Angastonite, ideally CaMgAl2(PO4)2(OH)4-7H2O, is a newly defined mineral from the Penrice marble quarry, South Australia. The mineral occurs as snow-white crusts and coatings up to ∼1 mm thick associated with minyulite, perhamite, crandallite and apatite-(CaF). The streak is white, the lustre is pearly and the estimated hardness is 2 on the Mohs scale. Angastonite forms platy crystals with the forms {010} (prominent), {101}, {101} and {100} (rare), and also occurs as replacements of an unknown pre-existing mineral. There is one cleavage direction on ﹛010} and no twinning has been observed. Angastonite is triclinic, P1̄, with a = 13.303(1) Å, b = 27.020(2) Å, c = 6.1070(7) Å α = 89.64(1)°, β = 83.44(1)°, γ = 80.444(8)°, V = 2150.5(4) Å3, with Z = 6. The mineral is optically biaxial (+), with refractive indices of α = 1.566(2), β = 1.572(2) and γ 1.584(2) and with 2Vmeas = 70(2)° and 2Vcalc = 71°. Orientation: X ≈ a, Y ≈ b, Z ≈ c; with crystals showing parallel extinction and no axial dispersion. Dmeas is 2.47 g/cm3, whilst Dcalc is 2.332 g/cm3. The strongest four powder-diffraction lines [d in Å, (I/I°), hkl] are: 13.38, (100), 020; 11.05, (25), 11̄0; 5.73, (23), 101, 230 and 111; 8.01, (21), 130. Angastonite is likely to be related to the montgomeryite-group members and have a similar crystal structure, based on slabs of phosphate tetrahedra and Al octahedra. |
|---|
These are possibly similar items as determined by title/reference text matching only.
