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Andrémeyerite

Formula:
BaFe
2+
2
[Si
 
2
O
 
7
]
System:MonoclinicColour:light emerald-green
Hardness:5½
This page provides mineralogical data about Andrémeyerite.

Classification of Andrémeyerite

IMA status:Approved 1972
Strunz 8th edition ID:8/C.02-90
Nickel-Strunz 10th (pending) edition ID:9.BB.20

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
Dana 8th edition ID:56.2.6c.6

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
Hey's CIM Ref.:14.7.8

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
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Type Occurrence of Andrémeyerite

Type Locality:Mt Nyiragongo, Goma, Kivu, Democratic Republic of Congo (Zaïre)
Year of Discovery:1973

Physical Properties of Andrémeyerite

Colour:light emerald-green
Hardness (Mohs):5½
Cleavage:Perfect

Crystallography of Andrémeyerite

Crystal System:Monoclinic
Cell Parameters:a = 7.48Å, b = 13.78Å, c = 7.08Å
β = 118.23°
Ratio:a:b:c = 0.543 : 1 : 0.514
Unit Cell Volume:V 642.97 ų (Calculated from Unit Cell)

Optical Data of Andrémeyerite

Type:Biaxial (+)
RI values: nα = 1.740 nβ = 1.740 nγ = 1.760
Maximum Birefringence:δ = 0.020

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r > v moderate

Chemical Properties of Andrémeyerite

Formula:
BaFe
2+
2
[Si
 
2
O
 
7
]
Essential elements:Ba, Fe, O, Si
All elements listed in formula:Ba, Fe, O, Si
Common Impurities:Al,Mn,Mg,Ca,Na,K

Relationship of Andrémeyerite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.BB.10Åkermanite
Ca
 
2
Mg[Si
 
2
O
 
7
]
9.BB.10Cebollite
Ca
 
5
Al
 
2
Si
 
3
O
 
12
(OH)
 
4
 or near
9.BB.10Gehlenite
Ca
 
2
Al[AlSiO
 
7
]
9.BB.10Gugiaite
Ca
 
2
Be[Si
 
2
O
 
7
]
9.BB.10Hardystonite
Ca
 
2
Zn[Si
 
2
O
 
7
]
9.BB.10Jeffreyite
(Ca,Na)
 
2
(Be,Al)[Si
 
2
O
 
6
(O,OH)]
9.BB.10Okayamalite
Ca
 
2
B[BSiO
 
7
]
9.BB.15Barylite
BaBe
 
2
[Si
 
2
O
 
7
]
9.BB.15Clinobarylite
BaBe
 
2
Si
 
2
O
 
7
Related Minerals - Hey's Index Grouping:

- +
14.7.1Sanbornite
Ba
 
2
[Si
 
4
O
 
10
]
14.7.2Krauskopfite
BaSi
 
2
O
 
5
·3H
 
2
O
14.7.3Walstromite
BaCa
 
2
[Si
 
3
O
 
9
]
14.7.4Macdonaldite
BaCa
 
4
Si
 
16
O
 
36
(OH)
 
2
·10H
 
2
O
14.7.5Ericssonite
BaMn
2+
2
Fe
3+
 
[O|OH|Si
 
2
O
 
7
]
14.7.6Orthoericssonite
BaMn
2+
2
Fe
3+
 
[O|OH|Si
 
2
O
 
7
]
14.7.7Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
14.7.9Pellyite
Ba
 
2
Ca(Fe,Mg)
 
2
Si
 
6
O
 
17
14.7.10Taikanite
Sr
 
3
BaMn
2+
2
[O|Si
 
2
O
 
6
]
 
2
14.7.11Willemite
Zn
 
2
[SiO
 
4
]
14.7.12Hemimorphite
Zn
 
4
[(OH)
 
2
|Si
 
2
O
 
7
] · H
 
2
O
14.7.13Zincsilite
Zn
 
3
Si
 
4
O
 
10
(OH)
 
2
·4H
 
2
O
14.7.14Hardystonite
Ca
 
2
Zn[Si
 
2
O
 
7
]
14.7.15Petedunnite
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
14.7.16Clinohedrite
CaZn[SiO
 
4
] · H
 
2
O
14.7.17Junitoite
CaZn
 
2
[Si
 
2
O
 
7
] · H
 
2
O
14.7.18Larsenite
PbZn[SiO
 
4
]
14.7.19Esperite
PbCa
 
3
Zn
 
4
[SiO
 
4
]
 
4
14.7.20Hodgkinsonite
Mn
2+
 
Zn
 
2
[(OH)
 
2
|SiO
 
4
]
14.7.21Gerstmannite
(Mg,Mn
2+
 
)Zn[(OH)
 
2
|SiO
 
4
]
14.7.22Gageite
Mn
 
21
O
 
3
(Si
 
4
O
 
12
)
 
2
(OH)
 
20
14.7.23Franklinfurnaceite
Ca
 
2
FeMn
 
3
MnZn
 
2
Si
 
2
O
 
10
(OH)
 
8

Other Names for Andrémeyerite

Synonyms:
IMA1972-005
Other Languages:
German:Andremeyerit
Russian:Андремейерит
Spanish:Andremeyerita

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 Andrémeyerite

Reference List:American Mineralogist: 59: 381.

American Mineralogist: 73: 608-612.

Articles/Blogs about Andrémeyerite

Internet Links for Andrémeyerite

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    Localities for Andrémeyerite

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    (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.
    Democratic Republic of Congo (Zaïre)
     
    • Kivu
      • Goma
    		Bul. Geol. Soc. Fin. 45 (1973), 1
    Mineral and/or Locality
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