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Ferromerrillite

Formula:
Ca
 
9
Fe
2+
 
Na[PO
 
4
]
 
7
System:Trigonal
Name:Named for George P. Merrill (1854-1929), Curator of Geology, U.S. National Museum (Smithsonian Institution) plus the FERRO- prefix in view of the dominance of Fe2+ in the composition.


Whitlockite Group

Fe2+-dominant analogue of Merrillite

Classification of Ferromerrillite

IMA status:Approved 2006
Strunz 8th edition ID:7/A.05-58
Strunz 9th edition ID:8.AC.45
Nickel-Strunz 10th (pending) edition ID:8.AC.45

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
Dana 8th edition ID:38.3.4.7

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
3 : (AB)3(XO4)2
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Type Occurrence of Ferromerrillite

Type Locality:Shergotty Martian meteorite, Gaya District, Bihar, India

Crystallography of Ferromerrillite

Crystal System:Trigonal
Class (H-M):3m - Ditrigonal Pyramidal
Space Group:R3c
Cell Parameters:a = 10.372Å, c = 37.217Å
Ratio:a:c = 1 : 3.588
Unit Cell Volume:V 3,467.34 ų (Calculated from Unit Cell)

Chemical Properties of Ferromerrillite

Formula:
Ca
 
9
Fe
2+
 
Na[PO
 
4
]
 
7
Essential elements:
All elements listed in formula:Ca, Fe, Na, O, P

Relationship of Ferromerrillite to other Species

Related to:
  • Whitlockite Group
    • Related Minerals - Nickel-Strunz Grouping):
    8.AC.05Howardevansite
    NaCuFe
     
    2
    		(VO
     
    4
    		)
     
    3
    8.AC.10Alluaudite
    (Na,Ca)Mn
    2+
     
    		(Fe
    3+
     
    		,Mn
    2+
     
    		,Fe
    2+
     
    		,Mg)
     
    2
    		(PO
     
    4
    		)
     
    3
    8.AC.10Arseniopleite
    NaCaMn
    2+
     
    		(Mn
    2+
     
    		,Mg)
     
    2
    		(AsO
     
    4
    		)
     
    3
    8.AC.10Caryinite
    (Na,Pb)(Ca,Na)((Ca,Mn
    2+
     
    		)(Mn
    2+
     
    		,Mg,Fe
    3+
     
    		)[AsO
     
    4
    		]
     
    3
    8.AC.10Ferroalluaudite
    (Na,Ca)Fe
    2+
     
    		(Fe
    3+
     
    		,Mn
    2+
     
    		,Fe
    2+
     
    		)
     
    2
    		(PO
     
    4
    		)
     
    3
    8.AC.10Hagendorfite
    NaCaMn
    2+
     
    		Fe
    2+
    2
    		(PO
     
    4
    		)
     
    3
    8.AC.10Johillerite
    Na(Mg,Zn)
     
    3
    		Cu[AsO
     
    4
    		]
     
    3
    8.AC.10Maghagendorfite
    NaMn(Mg,Fe,Fe)
     
    3
    		(PO
     
    4
    		)
     
    3
    8.AC.10Nickenichite
    Na
     
    0.8
    		Ca
     
    0.4
    		Cu
     
    0.4
    		(Mg,Fe)
     
    3
    		(AsO
     
    4
    		)
     
    3
    8.AC.10Varulite
    NaCaMn
    2+
     
    		Mn
    2+
    2
    		(PO
     
    4
    		)
     
    3
    8.AC.10Ferrohagendorfite
    (Na,Ca)
     
    2
    		Fe
    2+
     
    		(Fe
    2+
     
    		,Fe
    3+
     
    		)
     
    2
    		(PO
     
    4
    		)
     
    3
    8.AC.10Bradaczekite
    NaCu
     
    4
    		(AsO
     
    4
    		)
     
    3
    8.AC.10Yazganite
    NaFe
    3+
    2
    		(Mg,Mn
    2+
     
    		)[AsO
     
    4
    		]
     
    3
    		 · H
     
    2
    		O
    8.AC.10Ferro-alluaudite
    8.AC.15Bobfergusonite
    Na
     
    2
    		Mn
     
    5
    		FeAl(PO
     
    4
    		)
     
    6
    8.AC.15Ferrowyllieite
    (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO
     
    4
    		)
     
    3
    8.AC.15Qingheiite
    NaMn
    3+
     
    		Mg(Al,Fe
    3+
     
    		)[PO
     
    4
    		]
     
    3
    8.AC.15Rosemaryite
    (Na,Ca,Mn)(Mn,Fe
    2+
     
    		)(Fe
    3+
     
    		,Mg)Al(PO
     
    4
    		)
     
    3
    8.AC.15Wyllieite
    (Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO
     
    4
    		)
     
    3
    8.AC.15Ferrorosemaryite
    []NaFe
    2+
     
    		Fe
    3+
     
    		Al(PO
     
    4
    		)
     
    3
    8.AC.20Marićite
    NaFe
    2+
     
    		[PO
     
    4
    		]
    8.AC.25Berzeliite
    NaCa
     
    2
    		(Mg,Mn
    2+
     
    		)
     
    2
    		[AsO
     
    4
    		]
     
    3
    8.AC.25Manganberzeliite
    (Ca,Na)
     
    3
    		(Mn
    2+
     
    		,Mg)
     
    2
    		[AsO
     
    4
    		]
     
    3
    8.AC.25Palenzonaite
    (Ca,Na)
     
    3
    		CaMn
    2+
    2
    		[VO
     
    4
    		]
     
    3
    8.AC.25Schäferite
    Ca
     
    2
    		NaMg
     
    2
    		[VO
     
    4
    		]
     
    3
    8.AC.30Brianite
    Na
     
    2
    		CaMg[PO
     
    4
    		]
     
    2
    8.AC.35Vitusite-(Ce)
    Na
     
    3
    		(Ce,La,Nd)(PO
     
    4
    		)
     
    2
    8.AC.40Olgite
    Ba(NaSr)
     
    2
    		Na[PO
     
    4
    		]
     
    2
    8.AC.40Bario-olgite
    Ba(Na,Sr,REE)
     
    2
    		Na[PO
     
    4
    		]
     
    2
    8.AC.45Strontiowhitlockite
    Sr
     
    9
    		MgH[PO
     
    4
    		]
     
    7
    8.AC.45Whitlockite
    Ca
     
    9
    		Mg[PO
     
    3
    		OH][PO
     
    4
    		]
     
    6
    8.AC.45Merrillite
    Ca
     
    18
    		Na
     
    2
    		Mg
    2+
    2
    		[PO
     
    4
    		]
     
    14
    8.AC.45Tuite
    Ca
     
    3
    		[PO
     
    4
    		]
     
    2
    8.AC.50Chladniite
    {Ca}{Na
     
    8
    		}{Ca
     
    4
    		Na
     
    4
    		}{(Mg,Fe
    2+
     
    		)
     
    43
    		}[PO
     
    4
    		]
     
    36
    8.AC.50Fillowite
    {Mn
    2+
     
    		}{Na
     
    8
    		}{Ca
     
    4
    		Na
     
    4
    		}{(Mn
    2+
     
    		,Fe
    2+
     
    		)
     
    43
    		}[PO
     
    4
    		]
     
    36
    8.AC.50Johnsomervilleite
    {Ca}{Na
     
    6
    		[ ]
     
    2
    		}{Ca
     
    6
    		Na
     
    2
    		}{(Fe
    2+
     
    		,Mg,Mn
    2+
     
    		)
     
    43
    		}[PO
     
    4
    		]
     
    36
    8.AC.50Galileiite
    {Fe
    2+
     
    		}{Na
     
    8
    		}{Fe
    2+
    4
    		Na
     
    4
    		}{Fe
    2+
    43
    		}[PO
     
    4
    		]
     
    36
    8.AC.50Stornesite-(Y)
    {(Y, Ca)}{Na
     
    6
    		[ ]
     
    2
    		}{(Ca,Na)
     
    8
    		}{(Mg,Fe
    2+
     
    		)
     
    43
    		}[PO
     
    4
    		]
     
    36
    8.AC.50IMA2006-006
    Na
     
    4
    		Fe
    2+
    7
    		[PO
     
    4
    		]
     
    6
    8.AC.55Harrisonite
    Ca(Fe
    2+
     
    		,Mg)
     
    6
    		[PO
     
    4
    		|SiO
     
    4
    		]
     
    2
    8.AC.60Kosnarite
    KZr
     
    2
    		(PO
     
    4
    		)
     
    3
    8.AC.65Panethite
    (Na,Ca)
     
    2
    		(Mg,Fe
    2+
     
    		)
     
    2
    		[PO
     
    4
    		]
     
    2
    8.AC.70Stanfieldite
    Ca
     
    7
    		Ca
     
    2
    		Mg
     
    9
    		[PO
     
    4
    		]
     
    12
    8.AC.75Ronneburgite
    K
     
    2
    		MnV
     
    4
    		O
     
    12
    8.AC.80Tillmannsite
    (Ag
     
    3
    		Hg)[(VO
     
    4
    		, AsO
     
    4
    		)]
    8.AC.85Filatovite
    K[(Al,Zn)
     
    2
    		(As,Si)
     
    2
    		O
     
    8
    		]

    Other Names for Ferromerrillite

    Synonyms:
    IMA2006-039

    Other Information

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

    References for Ferromerrillite

    Reference List:IMA Website

    Internet Links for Ferromerrillite

    Search Engines:
  • Look for Ferromerrillite on Google
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    • External Links:
  • Look for Ferromerrillite on Webmineral
  • Look for Ferromerrillite on Athena Mineralogy
  • Look for Ferromerrillite on Wikipedia
  • Look for Ferromerrillite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Ferromerrillite in the Natural History Museum (London) online catalogue
    • Mineral Dealers:
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  • Search for Ferromerrillite on minvision.com
  • Wilensky Fine Minerals
  • The Arkenstone - Fine Minerals
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  • Find Ferromerrillite on www.crystalclassics.co.uk
  • Search for Ferromerrillite at Thames Valley Minerals
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    Localities for Ferromerrillite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    India
     
    • Bihar
      • Gaya District
    		IMA Website
    Mineral and/or Locality
    Google
     
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