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Merrillite-(Ca) Mineral Data
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General Merrillite-(Ca) Information
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 Chemical Formula: |
(Ca,[ ])19Mg2(PO4)14 |
| Composition: |
Molecular Weight = 2,099.61 gm |
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Calcium 34.36 % Ca 48.08 % CaO |
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Magnesium 2.32 % Mg 3.84 % MgO |
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Phosphorus 20.65 % P 47.32 % P2O5 |
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Oxygen 42.67 % O |
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______ ______ |
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100.00 % 99.24 % = TOTAL OXIDE |
| Empirical Formula: |
Ca18Mg2(PO4)14 |
| Environment: |
Extraterrestrial bodies. |
| IMA Status: |
Not Approved IMA 1977 |
| Locality: |
Lunar rocks. Link to MinDat.org Location Data. |
| Name Origin: |
Named after George Perkins Merrill (1854-1929), meteorite specialist at U. S. National Museum, Smithsonian Institution, Washington, D.C. USA. |
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Merrillite-(Ca) Crystallography
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| Axial Ratios: |
a:c = 1:3.58096 |
| Cell Dimensions: |
a = 10.362, c = 37.106, Z = 3; V = 3,450.34 Den(Calc)= 3.03 |
| Crystal System: |
Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3c |
| X Ray Diffraction: |
By Intensity(I/Io): 2.85(1), 2.58(0.6), 3.19(0.6),3.43(0.6), 5.18(0.6), 1.71(0.5), 1.92(0.5), 1.54(0.4), |
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Physical Properties of Merrillite-(Ca)
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| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
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Optical Properties of Merrillite-(Ca)
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| Gladstone-Dale: |
CI calc= -0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2051,KC= 0.1952
Ncalc = 1.59 |
| Optical Data: |
Uniaxial (-), e=1.62, w=1.623, bire=0.0030. |
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Calculated Properties of Merrillite-(Ca)
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| Electron Density: |
Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Merrillite-(Ca) =3.03 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0029838637
Boson Index = 0.9970161363 |
| Photoelectric: |
PEMerrillite-(Ca) = 5.27 barns/electron
U=PEMerrillite-(Ca) x rElectron Density= 15.85 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Merrillite-(Ca) is Not Radioactive |
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Merrillite-(Ca) Classification
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| Dana Class: |
38.03.04.03 (38)Anhydrous Phosphates, etc |
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(38.03)(A+ B++)3 (XO4)2 |
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(38.03.04)Whitlockite group |
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38.03.04.01 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m |
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38.03.04.02 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m |
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38.03.04.03 Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m |
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38.03.04.04 Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m |
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38.03.04.05 Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m |
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38.03.04.06 Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m |
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38.03.04.07 Tuite! Ca3(PO4)2 R 3m 3m |
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38.03.04.08 Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m |
| Strunz Class: |
08.AC.45 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.A - Phosphates, etc. without additional anions, without H2O |
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08.AC -With medium-sized and large cations |
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08.AC.45 Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m |
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08.AC.45 Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m |
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08.AC.45 Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m |
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08.AC.45 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m |
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08.AC.45 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m |
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08.AC.45 Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m |
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08.AC.45 Tuite! Ca3(PO4)2 R 3m 3m |
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08.AC.45 Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m |
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Other Merrillite-(Ca) Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) |
| See Also: |
Links to other databases for Merrillite-(Ca) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Print or Cut-and-Paste your Merrillite-(Ca) Specimen Label here :
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Merrillite-(Ca)
(Ca,[ ])19Mg2(PO4)14
Dana No: 38.03.04.03 Strunz No: 08.AC.45
Locality:
Notes:
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