Merrillite-(Ca) Mineral Data

Advertisment

McDougall Minerals sells high-quality mineral specimens from all over the world to collectors of all levels, from beginners to connoisseurs

Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

John Betts - Fine Minerals, New York. Dealers of Fine Minerals and Natural Crystal Clusters since 1989. We buy rock collections, we buy gem collections, we buy mineral collections.

Weinrich Minerals, A Dealer in Fine Mineral Specimens - Since 1989. We buy collections and single high quality specimens.

General Merrillite-(Ca) Information

Chemical Formula:

(Ca,[ ])19Mg2(PO4)14

Composition:

Molecular Weight = 2,099.61 gm

Calcium 34.36 % Ca 48.08 % CaO

Magnesium 2.32 % Mg 3.84 % MgO

Phosphorus 20.65 % P 47.32 % P₂O₅

Oxygen 42.67 % O

______ ______

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.

Search for Merrillite-(Ca) Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Merrillite-(Ca) Crystallography

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 PyramidalH-M Symbol (3m) Space Group: R 3c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Physical Properties of Merrillite-(Ca)

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Optical Properties of Merrillite-(Ca)

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.

Calculated Properties of Merrillite-(Ca)

Electron Density:

Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Merrillite-(Ca) =3.03 gm/cc.

Fermion Index:

Fermion Index = 0.0029838637
Boson Index = 0.9970161363

Photoelectric:

PE_{Merrillite-(Ca)}= 5.27 barns/electron
U=PE_{Merrillite-(Ca)} x rElectron Density= 15.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Merrillite-(Ca) is Not Radioactive

Merrillite-(Ca) Classification

Dana Class:

38.03.04.03 (38)Anhydrous Phosphates, etc

(38.03)(A+ B++)3 (XO4)2

(38.03.04)Whitlockite group

38.03.04.01 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m

38.03.04.02 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m

38.03.04.03 Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m

38.03.04.04 Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m

38.03.04.05 Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m

38.03.04.06 Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m

38.03.04.07 Tuite! Ca3(PO4)2 R 3m 3m

38.03.04.08 Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m

Strunz Class:

08.AC.45 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AC -With medium-sized and large cations

08.AC.45 Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m

08.AC.45 Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m

08.AC.45 Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m

08.AC.45 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m

08.AC.45 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m

08.AC.45 Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m

08.AC.45 Tuite! Ca3(PO4)2 R 3m 3m

08.AC.45 Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m

Other Merrillite-(Ca) Information

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

Search for Merrillite-(Ca) using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Merrillite-(Ca) :

A Bijoux Google Search for Merrillite-(Ca)
Dakota Matrix Minerals Google Search for Merrillite-(Ca)
John Betts Fine Minerals Search for Merrillite-(Ca)
McDougall Minerals Google Search for Merrillite-(Ca)
Rock and Mineral Shows Google Search for Merrillite-(Ca)
Weinrich Minerals, Inc. Google Search for Merrillite-(Ca)

Ask about Merrillite-(Ca) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Merrillite-(Ca) Specimen Label here :

Merrillite-(Ca)

(Ca,[ ])19Mg2(PO4)14
Dana No: 38.03.04.03 Strunz No: 08.AC.45
Locality:

Notes: