Schertelite Mineral Data

Schertelite Mineral Data +

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General Schertelite Information

Chemical Formula:

(NH4)2MgH2(PO4)2·4(H2O)

Composition:

Molecular Weight = 324.40 gm

Magnesium 7.49 % Mg 12.42 % MgO

Phosphorus 19.10 % P 43.76 % P₂O₅

Hydrogen 2.49 % H - % Calc as (NH₄)₂O

Hydrogen 3.11 % H 27.77 % H₂O

Nitrogen 8.64 % N 16.05 % (NH₄)₂O

Oxygen 59.18 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)₂MgH₂(PO₄)₂·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1902

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 2733

PDF 16-353

Schertelite Image

Images:

Schertelite

Comments: Transparent glassy crystalline schertelite grains.
Location: Skipton Caves, Ballarat, Victoria, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Schertelite Crystallography

Axial Ratios:

a:b:c =0.4853:1:0.3647

Cell Dimensions:

a = 11.47, b = 23.63, c = 8.62, Z = 8; V = 2,336.33 Den(Calc)= 1.84

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bca

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

By Intensity(I/I_o): 5.94(1), 2.97(0.43), 5.21(0.37),

Crystal Structure:

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Khan A A , Baur W H , Acta Crystallographica, Section B , 28 (1972) p.683-693, Salt hydrates. VIII. The crystal structures of sodium ammonium orthochromate, dihydrate and magnesium diammonium bis(hydrogen orthophosphate) tetrahydrate, and a discussion of the ammonium ion, Locality: synthetic

Physical Properties of Schertelite

Cleavage:

None

Color:

Colorless.

Density:

1.83

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Schertelite

Gladstone-Dale:

CI meas= -0.413 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.405 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2801,KPDmeas= 0.2816,KC= 0.1993

Optical Data:

Biaxial (+), a=1.508, b=1.515, g=1.523, bire=0.0150, 2V(Calc)=88, 2V(Meas)=90.

Calculated Properties of Schertelite

Electron Density:

r_electron=1.93 gm/cc
note: r_Schertelite=1.84 gm/cc.

Fermion Index

Fermion Index = 0.09381
Boson Index = 0.90619

Photoelectric:

PE_Schertelite= 1.17 barns/electron
U=PE_Schertelite x r_electron= 2.25 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schertelite is Not Radioactive

Schertelite Classification

Dana Class:

39.3.2.1 (39)Hydrated Acid Phosphates, etc

(39.3)with miscellaneous formulae

(39.3.2)Dana Group

39.3.2.1 Schertelite (NH4)2MgH2(PO4)2·4(H2O) P bca 2/m 2/m 2/m

Strunz Class:

VII/C.23-50 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.23 - Struvite - Mundrabillaite series

VII/C.23-10 Struvite (NH4)MgPO4·6(H2O) P mn2₁ mm2

VII/C.23-20 Dittmarite (NH4)Mg(PO4)·(H2O) P mn2₁ mm2

VII/C.23-30 Niahite (NH4)(Mn,Mg,Ca)PO4·(H2O) P mn2₁ mm2

VII/C.23-40 Hannayite (NH4)2Mg3H4(PO4)4·8(H2O) P1 1

VII/C.23-50 Schertelite (NH4)2MgH2(PO4)2·4(H2O) P bca 2/m 2/m 2/m

VII/C.23-60 Stercorite H(NH4)Na(PO4)·4(H2O) P1 1

VII/C.23-65 Swaknoite (NH4)2Ca(HPO4)2·(H2O) Unk Ortho

VII/C.23-70 Mundrabillaite (NH4)2Ca(HPO4)2·(H2O) Pm,P 2,P 2/m Mono

Other Schertelite Information

References:

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

See Also:

Links to other databases for Schertelite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Schertelite

(NH4)2MgH2(PO4)2·4(H2O)
Dana No: 39.3.2.1 Strunz No: VII/C.23-50
Locality:

Notes: