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Bearsite

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Formula:
Be
 
2
(AsO
 
4
)(OH) · 4H
 
2
O
System:MonoclinicColour:White
Name:For the chemical composition


The arsenic analogue of Moraesite

Classification of Bearsite

IMA status:Approved
Strunz 8th edition ID:7/D.01-20
Nickel-Strunz 10th (pending) edition ID:8.DA.05

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations
Dana 8th edition ID:42.6.1.2

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq·xH2O
Hey's CIM Ref.:20.2.1

20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
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Type Occurrence of Bearsite

Type Locality:Bota-Burum U deposit, Lake Alakol (Lake Aaköl), Almaty Province (Almaty Oblysy; Almati Oblast'), Kazakhstan
Year of Discovery:1962

Physical Properties of Bearsite

Colour:White
Density (measured):1.8 - 2.0 g/cm3
Density (calculated):2.199 g/cm3

Crystallography of Bearsite

Crystal System:Monoclinic
Cell Parameters:a = 8.55Å, b = 36.9Å, c = 7.13Å
β = 97.82°
Ratio:a:b:c = 0.232 : 1 : 0.193
Unit Cell Volume:V 2,228.56 ų (Calculated from Unit Cell)
Z:12
Morphology:Fine incrustations and tangled white fibrous aggregates of crystals
tenths to hundredths of a millimeter in size.

Optical Data of Bearsite

Type:Biaxial (-)
RI values: nα = 1.490 nβ = 1.502 nγ = 1.502
Maximum Birefringence:δ = 0.012

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:none

Chemical Properties of Bearsite

Formula:
Be
 
2
(AsO
 
4
)(OH) · 4H
 
2
O
Essential elements:As, Be, H, O
All elements listed in formula:As, Be, H, O

Relationship of Bearsite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DA.05Moraesite
Be
 
2
(PO
 
4
)(OH) · 4H
 
2
O
8.DA.10Roscherite
Ca
 
2
Mn
2+
5
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
8.DA.10Zanazziite
Ca
 
2
Mg
 
5
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
8.DA.10Greifensteinite
Ca
 
2
Fe
2+
5
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
8.DA.10Atencioite
Ca
 
2
Fe
2+
3
Mg
 
2
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
8.DA.10Ruifrancoite
Ca
 
2
◻
 
2
(Fe
3+
 
,Mn
2+
 
,Mg)
 
4
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
(OH,H
 
2
O)
 
2
 · 4H
 
2
O
8.DA.10Guimarãesite
Ca
 
2
(Zn,Mg,Fe
2+
 
)
 
5
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
8.DA.10Footemineite
Ca
 
2
Mn
2+
 
Mn
2+
2
Mn
2+
2
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
8.DA.15Uralolite
Ca
 
2
Be
 
4
(PO
 
4
)
 
3
(OH)
 
3
 · 5H
 
2
O
8.DA.20Weinebeneite
CaBe
 
3
(PO
 
4
)
 
2
(OH)
 
2
 · 4H
 
2
O
8.DA.25Tiptopite
K
 
2
(Na,Ca)
 
2
Li
 
3
Be
 
6
(PO
 
4
)
 
6
(OH)
 
2
 · H
 
2
O
8.DA.30Veszelyite
(Cu,Zn)
 
2
Zn(PO
 
4
)
 
2
 · 2H
 
2
O
8.DA.35Kipushite
(Cu,Zn)
 
5
Zn(PO
 
4
)
 
2
(OH)
 
6
 · H
 
2
O
8.DA.35Philipsburgite
(Cu,Zn)
 
6
(AsO
 
4
,PO
 
4
)
 
2
(OH)
 
6
 · H
 
2
O
8.DA.40Spencerite
Zn
 
4
(PO
 
4
)
 
2
(OH)
 
2
 · 3H
 
2
O
8.DA.45Glucine
CaBe
 
4
(PO
 
4
)
 
2
(OH)
 
4
 · 0.5H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.2.2Brassite
Mg(HAsO
 
4
) · 4H
 
2
O
20.2.3Rösslerite
Mg(HAsO
 
4
) · 7H
 
2
O
20.2.4Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.2.5Weilite
Ca(HAsO
 
4
)
20.2.6Johnbaumite
Ca
 
5
(AsO
 
4
)
 
3
OH
20.2.7Haidingerite
CaHAsO
 
4
 · H
 
2
O
20.2.8Pharmacolite
Ca(HAsO
 
4
) · 2H
 
2
O
20.2.9Sainfeldite
CaCa
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
20.2.10Vladimirite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 5H
 
2
O
20.2.11Guérinite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 9H
 
2
O
20.2.12Ferrarisite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 9H
 
2
O
20.2.13Rauenthalite
Ca
 
3
(AsO
 
4
)
 
2
 · 10H
 
2
O
20.2.14Phaunouxite
Ca
 
3
(AsO
 
4
)
 
2
 · 11H
 
2
O
20.2.15Mcnearite
NaCa
 
5
(AsO
 
4
)(HAsO
 
4
)
 
4
 · 4H
 
2
O
20.2.16Bergslagite
CaBeAsO
 
4
(OH)
20.2.17Adelite
CaMg(AsO
 
4
)(OH)
20.2.18Talmessite
Ca
 
2
Mg(AsO
 
4
)
 
2
 · 2H
 
2
O
20.2.19Irhtemite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
20.2.20Camgasite
CaMg(AsO
 
4
)(OH) · 5H
 
2
O
20.2.21Picropharmacolite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 11H
 
2
O
20.2.22Bariopharmacosiderite
Ba
 
0.5
Fe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 5H
 
2
O

Other Names for Bearsite

Other Languages:
German:Bearsit
Spanish:Bearsita

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 Bearsite

Reference List:

- +
E. V. Kopcnnnova and G. A. Srooncnko, Bearsite, the arsenic analogue of moraesite.
Zapiski Vses Minerolog. Obsheh.97, M2-446 (1962) (in Russian).

American Mineralogist: 48: 210.

Internet Links for Bearsite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Bearsite details from Handbook of Mineralogy (PDF)
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    • Localities for Bearsite

    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.
    Kazakhstan
     
    • Almaty Province (Almaty Oblysy; Almati Oblast')
      • Lake Alakol (Lake Aaköl)
    		Amer.Min.(1963) 48, 210-211
    Mineral and/or Locality
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    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: 21st Jun 2011 05:15:26
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