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Merrillite-(Ca)

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Formula:
(Ca,◻)19Mg2(PO4)14
Crystal System:
Trigonal
Name:
Named after George Perkins Merrill (1854-1929), meteorite specialist at U. S. National Museum, Smithsonian Institution, Washington, D.C. USA.
This page provides mineralogical data about Merrillite-(Ca).


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Classification of Merrillite-(Ca)Hide

38.3.4.3

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
3 : (AB)3(XO4)2

Optical Data of Merrillite-(Ca)Hide

Type:
Uniaxial (-)
RI values:
nω = 1.323 - 1.623 nε = 1.620
Max Birefringence:
δ = 0.297
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of Merrillite-(Ca)Hide

Formula:
(Ca,◻)19Mg2(PO4)14

Crystallography of Merrillite-(Ca)Hide

Crystal System:
Trigonal

Related Minerals - Dana Grouping (8th Ed.)Hide

38.3.4.1WhitlockiteCa9Mg(PO4)6(HPO4)Trig. 3m : R3c
38.3.4.2StrontiowhitlockiteSr9Mg(PO4)6(HPO4)Trig. 3m : R3c
38.3.4.4MerrilliteCa9NaMg(PO4)7Trig. 3m : R3m
38.3.4.6TuiteCa3(PO4)2Trig. 3m (3 2/m) : R3m
38.3.4.7FerromerrilliteCa9NaFe2+(PO4)7Trig. 3m : R3c
38.3.4.8BobdownsiteTrig. 3m : R3c

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Merrillite-(Ca)Hide

Mineral and/or Locality  
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