Adelite Mineral Data

Adelite Mineral Data +

General Adelite Information

Chemical Formula:

CaMg(AsO4)(OH)

Composition:

Molecular Weight = 220.31 gm

Calcium 18.19 % Ca 25.45 % CaO

Magnesium 11.03 % Mg 18.29 % MgO

Arsenic 34.01 % As 52.16 % As₂O₅

Hydrogen 0.46 % H 4.09 % H₂O

Oxygen 36.31 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMg(AsO₄)(OH)

Environment:

In manganese deposits at Langban.

IMA Status:

Valid Species (Pre-IMA) 1804

Locality:

Sweden, Värmland, Filipstad, Långban mn Link to MinDat.org Location Data.

Name Origin:

From the Greek for indistinct, for its occurrence as massive.

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Adelite Crystallography

Axial Ratios:

a:b:c =0.8502:1:0.661

Cell Dimensions:

a = 7.525, b = 8.85, c = 5.85, Z = 4; V = 389.59 Den(Calc)= 3.76

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.16(1), 2.59(0.7), 4.13(0.7),

Physical Properties of Adelite

Cleavage:

[???] Indistinct

Color:

Blue gray, Green, Gray, Yellow, Light green.

Density:

3.73 - 3.79, Average = 3.76

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5 - Apatite

Luminescence:

Non-fluorescent.

Luster:

Resinous

Streak:

white

Optical Properties of Adelite

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1918,KPDmeas= 0.1918,KC= 0.1884

Optical Data:

Biaxial (+), a=1.712, b=1.721, g=1.731, bire=0.0190

Calculated Properties of Adelite

Electron Density:

r_electron=3.62 gm/cc
note: r_Adelite=3.76 gm/cc.

Fermion Index

Fermion Index = 0.01145
Boson Index = 0.98855

Photoelectric:

PE_Adelite= 25.46 barns/electron
U=PE_Adelite x r_electron= 92.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Adelite is Not Radioactive

Adelite Classification

Dana Class:

41.5.1.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.1)Dana Group

41.5.1.1 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.2 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.3 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.4 Duftite-beta PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.5 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

41.5.1.6 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.7 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.8 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.9 Arsendescloizite PbZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.10 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

Strunz Class:

VII/B.26-10 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.26 - Adelite - Duftite group

VII/B.26-10 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-15 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-20 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-30 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-40 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-50 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-60 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-70 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

VII/B.26-80 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-80* Duftite-beta PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

Other Adelite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Adelite

CaMg(AsO4)(OH)
Dana No: 41.5.1.1 Strunz No: VII/B.26-10
Locality:

Notes: