Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Andrémeyerite

This page is currently not sponsored. Click here to sponsor this page.



Formula:
Fe
2+
2
Ba(Si
 
2
O
 
7
)
System:MonoclinicColour:light emerald-green
Hardness:5½
Name:To honor André Marie Meyer (1890-?), Belgian geologist with the Geological Survey of the Belgian Congo, who first collected the mineral.
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
mindat.org URL:http://www.mindat.org/min-225.html
Please feel free to link to this page.

Type Occurrence of Andrémeyerite

Type Locality:Mt Nyiragongo, Goma, Kivu, Democratic Republic of Congo (Zaïre)
Place of Conservation of Type Material:University of Helsinki, Helsinki, Finland.
Year of Discovery:1973
Geological Setting of type material:In vesicles of melilite-leucite-nephelinite; may represent crystallization of an associated green glass.
Associated Minerals at type locality:
TroiliteNephelineMelilite GroupMagnetiteMagnetite
LeuciteKirschsteiniteGlassClinopyroxene SubgroupApatite

Physical Properties of Andrémeyerite

Diaphaneity (Transparency):Transparent, Translucent
Colour:light emerald-green
Hardness (Mohs):5½
Cleavage:Perfect
Perfect on {100} and {010}

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)
Morphology:As crystals, < 0.2 mm, with {100} and {010} dominant, also {011} and {120}.
Twinning:Multiple twinning on {100}.

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:
Fe
2+
2
Ba(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
(SiO
 
4
)
 
3
(OH)
 
4
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
 
7
,HSi
 
2
O
 
7
)
9.BB.10Okayamalite
Ca
 
2
B(BSiO
 
7
)
9.BB.10Alumoåkermanite
(Ca,Na)
 
2
(Al,Mg,Fe
2+
 
)(Si
 
2
O
 
7
)
9.BB.15Barylite
Be
 
2
Ba(Si
 
2
O
 
7
)
9.BB.15Clinobarylite
Be
 
2
Ba(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+
 
(Si
 
2
O
 
7
)O(OH)
14.7.6Ericssonite-2O
BaMn
2+
2
Fe
3+
 
(Si
 
2
O
 
7
)O(OH)
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
(Si
 
4
O
 
12
)O
 
2
14.7.11Willemite
Zn
 
2
SiO
 
4
14.7.12Hemimorphite
Zn
 
4
Si
 
2
O
 
7
(OH)
 
2
 · 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
PbZnSiO
 
4
14.7.19Esperite
PbCa
 
2
Zn
 
3
(SiO
 
4
)
 
3
14.7.20Hodgkinsonite
Mn
2+
 
Zn
 
2
(SiO
 
4
)(OH)
 
2
14.7.21Gerstmannite
(Mg,Mn
2+
 
)Zn(SiO
 
4
)(OH)
 
2
14.7.22Gageite
Mn
 
21
O
 
3
(Si
 
4
O
 
12
)
 
2
(OH)
 
20
14.7.23Franklinfurnaceite
Ca
 
2
Fe
3+
 
Mn
2+
3
Mn
3+
 
(Zn
 
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:

- +
Sahama, T.G., Siivola, J. and P. Rehtijärvi, P. (1973): Andremeyerite, a new barium iron silicate from Nyiragongo, Zaire. Bull. Geol. Soc. Finland, 45, 1-8. [Abs. in American Mineralogist 59 (1974) 381].

Cannillo, E.C., Mazzi, F. and Rossi, G. (1988): Crystal structure of andremeyerite, BaFe(Fe;Mn;Mg)Si2O7. Amer. Mineral., 73, 608-612.

Internet Links for Andrémeyerite

Search Engines:
  • Look for Andrémeyerite on Google
  • Look for Andrémeyerite images on Google
    • External Links:
  • Look for Andrémeyerite on Webmineral
  • Look for Andrémeyerite on Athena Mineralogy[Link Broken?]
  • Look for Andrémeyerite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Andremeyerite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Fabre Minerals - search for Andrémeyerite specimens
  • Search for Andrémeyerite from all mineral dealers at minfind.com
  • Top quality minerals from Kristalle of California
  • By minerals from YourMineralCollection
  • Find Andrémeyerite on www.crystalclassics.co.uk
  • webminerals
  • Rare and Unusual minerals at Mineralogical Research Company
  • The Arkenstone - Fine Minerals
  • Wilensky Fine Minerals
  • Buy fine minerals and gemstones from Pala International
  • Search for minerals at Heliodor
    • Jobs:
  • Mining & Geology Jobs

    • Localities for Andrémeyerite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (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
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: 15th Nov 2011 18:26:31
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds