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Gottlobite

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Glücksstern Mine, Gottlob Hill, Friedrichroda, Thuringian Forest, Thuringia, Germany
© Thomas Witzke

Formula:
CaMg[OH|(VO
 
4
,AsO
 
4
)]
System:OrthorhombicColour:Orange to orange-brown
Lustre:Adamantine, VitreousHardness:4½
Name:For the type locality at the Glücksstern Mine, Gottlob Hill, Friedrichroda, Thuringian Forest, Thuringia, Germany.
Isostructural with:Adelite


Adelite-Desclozite Group. Vanadate analogue of Adelite.

Classification of Gottlobite

IMA status:Approved 1998
Strunz 8th edition ID:7/B.26-15
Nickel-Strunz 10th (pending) edition ID:8.BH.35

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
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Type Occurrence of Gottlobite

Type Locality:Glücksstern Mine, Gottlob Hill, Friedrichroda, Thuringian Forest, Thuringia, Germany

Physical Properties of Gottlobite

Lustre:Adamantine, Vitreous
Diaphaneity (Transparency):Transparent
Colour:Orange to orange-brown
Streak:brownish white
Hardness (Mohs):4½
Cleavage:None Observed
Fracture:Irregular/Uneven, Conchoidal
Density (calculated):3.46 g/cm3
Comment:3.41 and 3.58 for highest and lowest V content

Crystallography of Gottlobite

Crystal System:Orthorhombic
Class (H-M):2 2 2 - Disphenoidal
Space Group:P21 21 21
Cell Parameters:a = 7.501Å, b = 9.01Å, c = 5.941Å
Ratio:a:b:c = 0.833 : 1 : 0.659
Unit Cell Volume:V 401.5 ų
Z:4

Optical Data of Gottlobite

Type:Biaxial
RI values: nα = 1.797 nβ = 1.805 - 1.815 nγ = 1.828
2V:Calculated: 62° to 80°
Maximum Birefringence:δ = 0.031

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

Chemical Properties of Gottlobite

Formula:
CaMg[OH|(VO
 
4
,AsO
 
4
)]
Idealised Formula:
CaMg[OH|(VO
 
4
)]
Essential elements:Ca, H, Mg, O, V
All elements listed in formula:As, Ca, H, Mg, O, V

Relationship of Gottlobite to other Species

Series:Forms a series with Adelite (see here)
Related to:
  • Adelite-Descloizite Group
    • Related Minerals - Nickel-Strunz Grouping):

    - +
    8.BH.05Thadeuite
    Ca(Mg,Fe
    2+
     
    		)
     
    3
    		[(OH,F)|PO
     
    4
    		]
     
    2
    8.BH.10Durangite
    NaAl[F|AsO
     
    4
    		]
    8.BH.10Isokite
    CaMg[F|PO
     
    4
    		]
    8.BH.10Lacroixite
    NaAl[F|PO
     
    4
    		]
    8.BH.10Maxwellite
    NaFe
    3+
     
    		[F|AsO
     
    4
    		]
    8.BH.10Panasqueiraite
    CaMg[(OH,F)|PO
     
    4
    		]
    8.BH.10Tilasite
    CaMg[F|AsO
     
    4
    		]
    8.BH.15Drugmanite
    Pb(Fe
    3+
     
    		,Al)
     
    2
    		[OH|PO
     
    4
    		]
     
    2
    8.BH.20Bjarebyite
    (Ba,Sr)(Mn
    2+
     
    		,Fe
    2+
     
    		,Mg)
     
    2
    		Al
     
    2
    		[OH|PO
     
    4
    		]
     
    3
    8.BH.20Cirrolite
    near Ca
     
    3
    		Al
     
    2
    		(PO
     
    4
    		)
     
    3
    		(OH)
     
    3
    8.BH.20Kulanite
    Ba(Fe
    2+
     
    		,Mn
    2+
     
    		,Mg)
     
    2
    		(Al,Fe
    3+
     
    		)
     
    2
    		[OH|PO
     
    4
    		]
     
    3
    8.BH.20Penikisite
    Ba(Mg,Fe
    2+
     
    		,Ca)
     
    2
    		Al
     
    2
    		[OH|PO
     
    4
    		]
     
    3
    8.BH.20Perloffite
    Ba(Mn
    2+
     
    		,Fe
    2+
     
    		)
     
    2
    		Fe
    3+
    2
    		[OH|PO
     
    4
    		]
     
    3
    8.BH.20Johntomaite
    BaFe
    2+
    2
    		Fe
    3+
    2
    		[OH|PO
     
    4
    		]
     
    3
    8.BH.25Bertossaite
    (Li,Na)
     
    2
    		(Ca,Fe
    2+
     
    		,Mn
    2+
     
    		)Al
     
    4
    		[(OH,F)|PO
     
    4
    		]
     
    4
    8.BH.25Palermoite
    (Li,Na)
     
    2
    		(Sr,Ca)Al
     
    4
    		[PO
     
    4
    		]
     
    4
    		(OH)
     
    4
    8.BH.30Carminite
    PbFe
    3+
    2
    		[OH|AsO
     
    4
    		]
     
    2
    8.BH.30Sewardite
    CaFe
    3+
    2
    		(AsO
     
    4
    		)
     
    2
    		(OH)
     
    2
    8.BH.35Adelite
    CaMg[AsO
     
    4
    		](OH)
    8.BH.35Arsendescloizite
    PbZn[OH|AsO
     
    4
    		]
    8.BH.35Austinite
    CaZn[OH|AsO
     
    4
    		]
    8.BH.35Cobaltaustinite
    CaCo[OH|AsO
     
    4
    		]
    8.BH.35Conichalcite
    CaCu[OH|AsO
     
    4
    		]
    8.BH.35Duftite
    PbCu[OH|AsO
     
    4
    		]
    8.BH.35Gabrielsonite
    PbFe[OH|AsO
     
    4
    		]
    8.BH.35Nickelaustinite
    Ca(Ni,Zn)[OH|AsO
     
    4
    		]
    8.BH.35Tangeite
    CaCu[OH|VO
     
    4
    		]
    8.BH.40Čechite
    Pb(Fe
    2+
     
    		,Mn
    2+
     
    		)[OH|VO
     
    4
    		]
    8.BH.40Descloizite
    Pb(Zn,Cu)[OH|VO
     
    4
    		]
    8.BH.40Mottramite
    Pb(Cu,Zn)[OH|VO
     
    4
    		]
    8.BH.40Pyrobelonite
    PbMn
    2+
     
    		[OH|VO
     
    4
    		]
    8.BH.45Bayldonite
    Cu
     
    3
    		Pb[OH|AsO
     
    4
    		]
     
    2
    8.BH.45Vésigniéite
    BaCu
     
    3
    		[OH|VO
     
    4
    		]
     
    2
    8.BH.50Paganoite
    NiBi[O|AsO
     
    4
    		]
    8.BH.55Jagowerite
    BaAl
     
    2
    		[OH|PO
     
    4
    		]
     
    2
    8.BH.60Attakolite
    (Ca,Sr)Mn(Al,Fe)
     
    4
    		[(OH)
     
    4
    		|(SiO
     
    4
    		,PO
     
    4
    		)|(HPO
     
    4
    		,PO
     
    4
    		)
     
    3
    		]
    8.BH.65Leningradite
    PbCu
     
    3
    		[Cl|VO
     
    4
    		]
     
    2

    Other Names for Gottlobite

    Synonyms:
    IMA1998-066
    Other Languages:
    German:Gottlobit
    Russian:Готтлобит
    Spanish:Gottlobita

    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 Gottlobite

    Reference List:T. Witzke, M. Steins, T. Doering and U. Kolitsch (2000): Gottlobite, CaMg(VO4,AsO4)(OH), a new mineral from Friedrichroda, Thuringia, Germany. N. Jb. Mineral. Mh. 2000, 444-454.

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    Localities for Gottlobite

    (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.
    Germany
     
    • Thuringia
      • Thuringian Forest
        • Friedrichroda
          • Gottlob Hill
    		[Neues Jahrb.Min.,Mh.(2000) 444-454; MinRec 32:417]
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