Morelandite Mineral Data

Morelandite Mineral Data +

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General Morelandite Information

Chemical Formula:

(Ba,Ca,Pb)5(AsO4,PO4)3Cl

Composition:

Molecular Weight = 1,005.93 gm

Barium 40.96 % Ba 45.73 % BaO

Calcium 5.98 % Ca 8.36 % CaO

Arsenic 18.62 % As 28.56 % As₂O₅

Phosphorus 1.54 % P 3.53 % P₂O₅

Lead 10.30 % Pb 11.09 % PbO

Chlorine 3.52 % Cl 3.52 % Cl

- % Cl -0.80 % -O=Cl₂

Oxygen 19.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba₃Ca_1.5Pb_0.5(AsO₄)_2.5(PO₄)_0.5Cl

IMA Status:

Approved IMA 1978

Locality:

Jakobsberg mine, near Hordmark, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Groven C. Moreland (1912-1978), supervisor of sample preparation laboratory, National Museum of Natural History, Smithsonian Institution, Washington, DC., USA.

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Morelandite Crystallography

Axial Ratios:

a:c = 1:0.71934

Cell Dimensions:

a = 10.169, c = 7.315, Z = 2; V = 655.09 Den(Calc)= 5.10

Crystal System:

HexagonalSpace Group: P 6₃/m,P 6₃

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

By Intensity(I/I_o): 3.03(1), 2.969(0.7), 2.935(0.6),

Physical Properties of Morelandite

Cleavage:

[0001] Indistinct

Color:

Greenish yellow, Gray, Grayish yellow, Light yellow.

Density:

5.32

Diaphaniety:

Transparent to Translucent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Morelandite

Gladstone-Dale:

CI meas= -0.072 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.118 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1729,KPDmeas= 0.1658,KC= 0.1547

Optical Data:

Uniaxial (+), w=1.88, e=1.884, bire=0.0040.

Calculated Properties of Morelandite

Electron Density:

r_electron=4.68 gm/cc
note: r_Morelandite=5.32 gm/cc.

Fermion Index

Fermion Index = 0.09592
Boson Index = 0.90408

Photoelectric:

PE_Morelandite= 381.58 barns/electron
U=PE_Morelandite x r_electron=1,783.94 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Morelandite is Not Radioactive

Morelandite Classification

Dana Class:

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

(41.8)where (A)5 (XO4)3 Zq

(41.8.5)Dana Group

41.8.5.1 Morelandite (Ba,Ca,Pb)5(AsO4,PO4)3Cl P 6₃/m,P 6₃ Hex

41.8.5.2 Alforsite Ba5(PO4)3Cl P 6₃/m 6/m

Strunz Class:

VII/B.39-130 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.39 - Apatite - Pyromorphite group

VII/B.39-10 Fluorapatite Ca5(PO4)3F P 6₃/m 6/m

VII/B.39-20 Chlorapatite Ca5(PO4)3Cl P 6₃/m 6/m

VII/B.39-30 Hydroxylapatite Ca5(PO4)3(OH) P 6₃/m 6/m

VII/B.39-40 Carbonate-hydroxylapatite Ca5(PO4,CO3)3(OH) P 6₃/m 6/m

VII/B.39-50 Carbonate-fluorapatite Ca5(PO4,CO3)3F P 6₃/m 6/m

VII/B.39-60 Svabite Ca5(AsO4)3F P 6₃/m 6/m

VII/B.39-70 Turneaureite Ca5[(As,P)O4]3Cl P 6₃/m 6/m

VII/B.39-80 Johnbaumite Ca5(AsO4)3(OH) P 6₃/m,P 6₃ Hex

VII/B.39-90 Fermorite (Ca,Sr)5(AsO4,PO4)3(OH) P 6₃/m 6/m

VII/B.39-95 Fluorcaphite! (Ca,Sr,Ce,Na)5(PO4)3F P 6₃ 6

VII/B.39-100 Strontium-apatite (Sr,Ca)5(PO4)3(F,OH) P 6₃/m 6/m

VII/B.39-110 Belovite-(Ce) (Sr,Ce,Na,Ca)5(PO4)3(OH) P 3 3

VII/B.39-115 Belovite-(La)! (Sr,La,Ce,Ca)5(PO4)3(F,OH) P 3 3

VII/B.39-117 Kuannersuite-(Ce)! Ba6Na2REE2(PO4)6FCl P 3 3

VII/B.39-120 Alforsite Ba5(PO4)3Cl P 6₃/m 6/m

VII/B.39-130 Morelandite (Ba,Ca,Pb)5(AsO4,PO4)3Cl P 6₃/m,P 6₃ Hex

VII/B.39-140 Hedyphane Ca2Pb3(AsO4)3Cl P 6₃/m 6/m

VII/B.39-150 Pyromorphite Pb5(PO4)3Cl P 6₃/m 6/m

VII/B.39-160 Mimetite Pb5(AsO4)3Cl P 6₃/m 6/m

VII/B.39-165 Clinomimetite Pb5(AsO4)3Cl P 2₁/b 2/m

VII/B.39-170 Vanadinite Pb5(VO4)3Cl P 6₃/m 6/m

Other Morelandite Information

References:

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

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Morelandite

(Ba,Ca,Pb)5(AsO4,PO4)3Cl
Dana No: 41.8.5.1 Strunz No: VII/B.39-130
Locality:

Notes: