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Nagelschmidtite

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About NagelschmidtiteHide

Formula:
Ca7(SiO4)2(PO4)2
Colour:
yellowish white
Crystal System:
Hexagonal
Name:
Named in honor of Guenther Nagelschmidt (?, Germany - 19 July 1980), chemist and mineralogist that made the first report of the phase in a slag. He worked at the Safety in Mines Research Establishment, studying mineral dust as a hazard for miners of coal and other materials. He was a pioneer in the use of X-ray diffraction and electron microscopy in the study of mineral dusts.
Closely related to (chemically similar) flamite. There is also a synthetic compound, 'Unnamed (Ca-Na Phosphate)', said to be a member of the nagelschmidtite family.

The original material seem to contain two polymorphs. Structurally similar to α-C2S (an abbreviated form of α-Ca2SiO4); as in this phase, the nagelschmidtite structure is based on Ca and Ca-T layers, the latter containing vacant Ca sites due to phosphate-for-silicate substitution. Arrangement of tetrahedral (anion) units in the mineral is similar to that found in α, α’H, α’L and β forms of the C2S phase.

Silicophosphates such as nagelschmidtite are important constituents of slags, said to be CaO- and P-containing fertilizers.


Classification of NagelschmidtiteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.HA.60

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
53.2.2.1

53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
2 : Insular SiO4 Groups and Other Anions of Complex Cations with (SO4), (CrO4), (PO4), etc·
17.6.1

17 : Silicates Containing other Anions
6 : Silicates with phosphate

Physical Properties of NagelschmidtiteHide

Colour:
yellowish white
Streak:
white
Cleavage:
Distinct/Good

Optical Data of NagelschmidtiteHide

Type:
Biaxial (+/-)
RI values:
nα = 1.638 - 1.680 nβ = 1.652 - 1.698
Max Birefringence:
δ = 1.638
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r < v strong

Chemical Properties of NagelschmidtiteHide

Formula:
Ca7(SiO4)2(PO4)2
Emperical Formula (of original material):
(Ca3.78Na0.06K0.06)3.90(Si1.58P0.40)1.98O8
Common Impurities:
Al,Fe,Cr,Mn,Mg,Na,K,P,S

Crystallography of NagelschmidtiteHide

Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P61
Cell Parameters:
a = 5.38 Å, c = 7.1 Å
Ratio:
a:c = 1 : 1.32
Unit Cell V:
177.97 ų (Calculated from Unit Cell)
Twinning:
complex, resulting in lamellae intersecting at 60o
Comment:
Structure solution of synthetic sample gave P61 space group, a = 10.82 Å, c = 21.46 Å (Sugiyama et al., 2010).

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.66 Å(vs)
2.80 Å(s)
1.94 Å(s)
3.80 Å(m)
3.42 Å(m)
2.20 Å(m)
1.34 Å(m)

Type Occurrence of NagelschmidtiteHide

General Appearance of Type Material:
elongated, anhedral grains, up to 150 microns in size
Geological Setting of Type Material:
HT contact-metamorphosed sedimentary rock (a pyrometamorphic formation)
Associated Minerals at Type Locality:

Other Language Names for NagelschmidtiteHide

Related Minerals - Nickel-Strunz GroupingHide

9.HA.05ErtixiiteNa2Si4O9Iso.
9.HA.10KenyaiteNa2Si22O41(OH)8 · 6H2OMon.
9.HA.20WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15Mon.
9.HA.25MagbasiteKBaFe3+Mg7Si8O22(OH)2F6Orth. mmm (2/m 2/m 2/m) : Cmma
9.HA.30AfanasyevaiteCa8[Si2O7]OCl2
9.HA.40IgumnoviteCa3Al2(SiO4)2Cl4Iso.
9.HA.50RudenkoiteSr3(Al3.5Si3.5)O10(OH,O)8Cl2 · H2OMon.
9.HA.55FoshallasiteCa3[Si2O7] · 3H2O(?)
9.HA.65Caryochroite(Na,Sr)3(Fe3+,Mg)10[Ti2Si12O37] · (H2O,O,OH)17Mon.
9.HA.70JuaniteCa10Mg4Al2Si11O39 · 4H2O or near
9.HA.75TacharaniteCa12Al2Si18O33 (OH)36Mon.
9.HA.80OyeliteCa10Si8B2O29 · 12.5H2OOrth.
9.HA.85DenisoviteK14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4-x) · 2H2OMon.
9.HA.90Tiettaite(Na,K)17FeTiSi16O29(OH)30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Cmcm

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.6.2PerhamiteCa3Al7.7Si3P4O23.5(OH)14.1 · 8H2OTrig. 3m (3 2/m) : P3m1
17.6.3Viséite
17.6.4PhosinaiteNa13Ca2(Ce,La,Th,Nd,Pr)(Si4O12)(PO4)4
17.6.5ClinophosinaiteNa12(Ca,Sr)4(Si4O12)(PO4)4Mon.
17.6.6Karnasurtite-(Ce)(Ce,La,Th)(Ti,Nb)(Al,Fe)(Si2O7)(OH)4 · 3H2OAmor.
17.6.7LomonosoviteNa5Ti2(Si2O7)(PO4)O2Tric. 1 : P1
17.6.8BornemaniteNa6BaTi2Nb(Si2O7)2(PO4)O2(OH)F Tric. 1 : P1
17.6.9SoboleviteNa13Ca2Mn2Ti3(Si2O7)2(PO4)4O3F3Mon. m : Pb
17.6.10Laplandite-(Ce)Na4CeTiPO4Si7O18 · 5H2OOrth. mmm (2/m 2/m 2/m) : Pmmm
17.6.11 VunonnemiteNa5TiNb3Si6O25F2 · 2Na3PO4
17.6.12Saryarkite-(Y)Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2OTet. 4 2 2
17.6.13Steenstrupine-(Ce)Na14Mn2+2Fe3+2Ce6Zr(Si6O18)2(PO4)6(PO3OH)(OH)2 · 2H2OTrig.
17.6.14WaylanditeBiAl3(PO4)2(OH)6Trig. 3m (3 2/m) : R3m
17.6.15Britholite-(Ce)(Ce,Ca)5(SiO4)3OHHex. 6/m : P63/m
17.6.16Britholite-(Y)(Y,Ca)5(SiO4)3OHHex. 6/m : P63/m
17.6.17EylettersiteTh0.75Al3(PO4)2(OH)6Trig.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for NagelschmidtiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Barrett, R.L., McCaughey, W.J. (1942) The system CaO-SiO2-P2O5. American Mineralogist: 27: 680-695.
Bredig, M.A (1942) Isomorphism and allotrophy in compounds of the type A2XO4. Journal of Physical Chemistry: 46: 747-764.
Segnit, E.R. (1950) New data on the slag-minerals nagelschmidtite and steadite. Mineralogical Magazine: 29: 173-190.
Gross, S. (1977) The mineralogy of the Hatrurim formation, Israel. Geological Survey of Israel, Bulletin 70: 1-80.
Fleischer, M., Cabri, L.J., Chao, G.Y., Pabst, A. (1978) New mineral names. American Mineralogist: 63: 424-427.
Sugiyama, K., Kato, Y., Mikouchi, T. (2010) Structure of nagelschmidtite Ca7Si2P2O16. 20th General Meeting of the IMA (IMA2010), Budapest, Hungary, August 21-27, CD of Abstracts: 725-725.
Gfeller, F., Widmer, R., Krüger, B., Galuskin, E.V., Galuskina, I.O., Armbruster, T. (2015) The crystal structure of flamite and its relation to Ca2SiO4 polymorphs and nagelschmidtite. European Journal of Mineralogy: 27: 755-769.
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for NagelschmidtiteHide

Localities for NagelschmidtiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Israel
 
  • Southern District (HaDarom District)
    • Tamar Regional Council
Sharygin, V.V., Sokol, E.V. & Vapnik, Ye. (2008): Minerals of the pseudobinary perovskite-brownmillerite series from combustion metamorphic larnite rocks of the Hatrurim Formation (Israel). Russian Geology and Geophysics 49, 709-726.
Middle East (TL)
 
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
Palestine
 
  • West Bank
    • Jericho Governorate
Seryotkin Y.V., Sokol E.V. & Kokh S.N. 2012: Natural pseudowollastonite: Crystal structure, associated minerals, and geological context. Lithos, vol. 134-135, pp. 75-90; Seryotkin, Yu.V., Sokol, E.V., Kokh, S.N. (2012): Natural pseudowollastonite: Crystal structure, associated minerals, and geological context. Lithos, 134–135, 75-90.
Russia
 
  • Murmansk Oblast
    • Lovozersky District
Pakhomovsky, Y. A., Ivanyuk, G. Y., & Yakovenchuk, V. N. (2014). Loparite-(Ce) in rocks of the Lovozero layered complex at Mt. Karnasurt and Mt. Kedykvyrpakhk. Geology of Ore Deposits, 56(8), 685-698.
 
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