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Minasgeraisite-(Y)

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Jaguaraçu Pegmatite (José Miranda Mine; Ze Pinto Mine; José Pinto Mine; Carneirinho Mine), Jaguaraçu, Minas Gerais, Southeast Region, Brazil
© Leon Hupperichs

Show Minasgeraisite-(Y) Photos (2)
Formula:
Y
 
2
CaBe
 
2
[O|SiO
 
4
]
 
2
System:MonoclinicColour:Lavender, Purple
Lustre:Sub-Vitreous, EarthyHardness:6 - 7
Name:After the type locality in the state of Minas Gerais, Brazil, plus the suffix "-(Y)" due to the dominance of yttrium in the composition.


Gadolinite-Datolite Group.

Classification of Minasgeraisite-(Y)

IMA status:Approved 1983
Strunz 8th edition ID:8/B.29-40
Nickel-Strunz 10th (pending) edition ID:9.AJ.20

9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
Dana 8th edition ID:54.2.1b.6

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in [4] coordination
Hey's CIM Ref.:14.3.15

14 : Silicates not Containing Aluminum
3 : Silicates of Be
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Type Occurrence of Minasgeraisite-(Y)

Type Locality:Jaguaraçu, Minas Gerais, Southeast Region, Brazil

Physical Properties of Minasgeraisite-(Y)

Lustre:Sub-Vitreous, Earthy
Colour:Lavender, Purple
Hardness (Mohs):6 - 7

Crystallography of Minasgeraisite-(Y)

Crystal System:Monoclinic

Optical Data of Minasgeraisite-(Y)

Type:Biaxial (+)
RI values: nα = 1.740 nβ = 1.754 nγ = 1.786
2V:Measured: 68° , Calculated: 68°
Maximum Birefringence:δ = 0.046

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 Minasgeraisite-(Y)

Formula:
Y
 
2
CaBe
 
2
[O|SiO
 
4
]
 
2
Essential elements:Be, Ca, O, Si, Y
All elements listed in formula:Be, Ca, O, Si, Y

Relationship of Minasgeraisite-(Y) to other Species

Related to:
  • Gadolinite-Datolite Group
    • Related Minerals - Nickel-Strunz Grouping):
    9.AJ.05Grandidierite
    (Mg,Fe
    2+
     
    		)(Al,Fe
    3+
     
    		)
     
    3
    		[O
     
    2
    		|BO
     
    3
    		|SiO
     
    4
    		]
    9.AJ.05Ominelite
    (Fe
    2+
     
    		,Mg)(Al,Fe
    3+
     
    		)
     
    3
    		[O
     
    2
    		|BO
     
    3
    		|SiO
     
    4
    		]
    9.AJ.10Dumortierite
    (Al,Fe
    3+
     
    		)
     
    7
    		[O
     
    3
    		|BO
     
    3
    		|(SiO
     
    4
    		)
     
    3
    		]
    9.AJ.10Holtite
    (Ta,Sb)Al
     
    6
    		[O
     
    3
    		|BO
     
    3
    		|(SiO
     
    4
    		)
     
    3
    		]
    9.AJ.10Magnesiodumortierite
    (Mg,Ti,[](Al,Mg)
     
    2
    		Al
     
    4
    		Si
     
    3
    		O
     
    18-y
    		(OH)
     
    y
    		B y = 2-3
    9.AJ.15Garrelsite
    Ba
     
    3
    		NaSi
     
    2
    		B
     
    7
    		O
     
    16
    		(OH)
     
    4
    9.AJ.20Bakerite
    Ca
     
    4
    		B
     
    4
    		[(OH)
     
    4
    		|HBO
     
    4
    		|(SiO
     
    4
    		)
     
    3
    		]
    9.AJ.20Datolite
    CaB[OH|SiO
     
    4
    		]
    9.AJ.20Gadolinite-(Ce)
    (Ce,La,Nd,Y)
     
    2
    		Fe
    2+
     
    		Be
     
    2
    		[O|SiO
     
    4
    		]
     
    2
    9.AJ.20Gadolinite-(Y)
    Y
     
    2
    		Fe
    2+
     
    		Be
     
    2
    		[O|SiO
     
    4
    		]
     
    2
    9.AJ.20Hingganite-(Ce)
    Ce
     
    2
    		□Be
     
    2
    		Si
     
    2
    		O
     
    8
    		(OH)
     
    2
    9.AJ.20Hingganite-(Y)
    (Y,Yb,Er)Be[OH|SiO
     
    4
    		]
    9.AJ.20Hingganite-(Yb)
    (Yb,Y)Be[OH|SiO
     
    4
    		]
    9.AJ.20Homilite
    Ca
     
    2
    		(Fe
    2+
     
    		,Mg)B
     
    2
    		[O|SiO
     
    4
    		]
     
    2
    9.AJ.20Melanocerite-(Ce)
    (Ce,Ca)
     
    5
    		(Si,B)
     
    3
    		O
     
    12
    		(OH,F)·nH
     
    2
    		O
    9.AJ.20Calcybeborosilite-(Y)
    (Y,Ca)
     
    2
    		(B,Be)
     
    2
    		[SiO
     
    4
    		]
     
    2
    		(OH,O)
     
    2
    9.AJ.25Stillwellite-(Ce)
    (Ce,La,Ca)BSiO
     
    5
    9.AJ.30Cappelenite-(Y)
    Ba(Y,Ce)
     
    6
    		Si
     
    3
    		B
     
    6
    		O
     
    24
    		F
     
    2
    9.AJ.35Okanoganite-(Y)
    (Na,Ca)
     
    3
    		(Y,Ce)
     
    12
    		Si
     
    6
    		B
     
    2
    		O
     
    27
    		F
     
    14
    9.AJ.35Vicanite-(Ce)
    (Ca,Ce,La,Th)
     
    15
    		As
    5+
     
    		(As
    3+
    0.5
    		,Na
     
    0.5
    		)Fe
    3+
     
    		Si
     
    6
    		B
     
    4
    		O
     
    40
    		F
     
    7
    9.AJ.35Hundholmenite-(Y)
    (Y,REE,Ca,Na)
     
    15
    		(Al,Fe
    3+
     
    		)(Ca
     
    x
    		As
    3+
    1-x
    		)(Si,As
    5+
     
    		)Si
     
    6
    		B
     
    3
    		(O,F)
     
    48
    9.AJ.35IMA2008-007
    (Y,REE,Ca,Na,Mn)
     
    15
    		Fe
    2+
     
    		Ca(P,Si)Si
     
    6
    		B
     
    3
    		(O,F)
     
    48
    9.AJ.40Jadarite
    LiNaSiB
     
    3
    		O
     
    7
    		(OH)
    Related Minerals - Hey's Index Grouping:
    14.3.1Phenakite
    Be
     
    2
    		[SiO
     
    4
    		]
    14.3.2Bertrandite
    Be
     
    4
    		[(OH)
     
    2
    		|Si
     
    2
    		O
     
    7
    		]
    14.3.3Beryllite
    Be
     
    3
    		[(OH)
     
    2
    		|SiO
     
    4
    		] · H
     
    2
    		O
    14.3.4Liberite
    Li
     
    2
    		Be[SiO
     
    4
    		]
    14.3.5Chkalovite
    Na
     
    2
    		BeSi
     
    2
    		O
     
    6
    14.3.6Eudidymite
    NaBeSi
     
    3
    		O
     
    7
    		OH
    14.3.7Epididymite
    NaBeSi
     
    3
    		O
     
    7
    		OH
    14.3.8Gugiaite
    Ca
     
    2
    		Be[Si
     
    2
    		O
     
    7
    		]
    14.3.9Jeffreyite
    (Ca,Na)
     
    2
    		(Be,Al)[Si
     
    2
    		O
     
    6
    		(O,OH)]
    14.3.10Semenovite-(Ce)
    (Na,Ca)
     
    9
    		Fe
    2+
     
    		(Ce,La)
     
    2
    		[(Si,Be)
     
    5
    		(O,OH,F)
     
    12
    		]
     
    4
    14.3.11Barylite
    BaBe
     
    2
    		[Si
     
    2
    		O
     
    7
    		]
    14.3.12Hingganite-(Ce)
    Ce
     
    2
    		□Be
     
    2
    		Si
     
    2
    		O
     
    8
    		(OH)
     
    2
    14.3.13Hingganite-(Yb)
    (Yb,Y)Be[OH|SiO
     
    4
    		]
    14.3.14Hingganite-(Y)
    (Y,Yb,Er)Be[OH|SiO
     
    4
    		]
    14.3.16Sørensenite
    Na
     
    4
    		SnBe
     
    2
    		Si
     
    6
    		O
     
    16
    		(OH)
     
    4
    14.3.17Trimerite
    CaMn
    2+
    2
    		Be
     
    3
    		[SiO
     
    4
    		]
     
    3
    14.3.18Chiavennite
    CaMnBe
     
    2
    		Si
     
    5
    		O
     
    13
    		(OH)
     
    2
    		·2H
     
    2
    		O
    14.3.19Tvedalite
    (Ca,Mn)
     
    4
    		Be
     
    3
    		Si
     
    6
    		O
     
    17
    		(OH)
     
    4
    		·3H
     
    2
    		O
    14.3.20Harstigite
    Ca
     
    6
    		(Mn,Mg)Be
     
    4
    		Si
     
    6
    		(O,OH)
     
    24
    14.3.21Sverigeite
    NaMnMgSnBe
     
    2
    		Si
     
    3
    		O
     
    12
    		(OH)
    14.3.22Joesmithite
    [(Ca,Pb)][(Ca,Pb)
     
    2
    		][(Mg,Fe
    2+
     
    		)
     
    5
    		][(OH)
     
    2
    		|BeSi
     
    7
    		O
     
    22
    		]
    14.3.23Gadolinite-(Y)
    Y
     
    2
    		Fe
    2+
     
    		Be
     
    2
    		[O|SiO
     
    4
    		]
     
    2
    14.3.24Gadolinite-(Ce)
    (Ce,La,Nd,Y)
     
    2
    		Fe
    2+
     
    		Be
     
    2
    		[O|SiO
     
    4
    		]
     
    2
    14.3.25Calciogadolinite
    (Y,Ca)
     
    2
    		(Fe,Fe)Be
     
    2
    		Si
     
    2
    		(O,OH)
     
    10

    Other Names for Minasgeraisite-(Y)

    Synonyms:
    IMA1983-090

    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 Minasgeraisite-(Y)

    Reference List:American Mineralogist (1986): 71: 603-607.

    Internet Links for Minasgeraisite-(Y)

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    Localities for Minasgeraisite-(Y)

    (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.
    Brazil
     
    • Southeast Region
      • Minas Gerais
    		[American Mineralogist, 71, pp. 603-607 (1986); Mineralogical Record - Vol 25 No.3]
    Mineral and/or Locality
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