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Nagelschmidtite

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Hatrurim Formation, Negev, Israel
© luigi chiappino




Formula:
Ca
 
7
(SiO
 
4
)
 
2
(PO
 
4
)
 
2
System:HexagonalColour:yellowish white
This page provides mineralogical data about Nagelschmidtite.

Classification of Nagelschmidtite

IMA status:Approved
Explanation of status:Name of synthetic phase applied to natural occurrence. Originally described in 1977.
Strunz 8th edition ID:8/B.22-70
Nickel-Strunz 10th (pending) edition ID:9.HA.60

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
Dana 8th edition ID: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·
Hey's CIM Ref.:17.6.1

17 : Silicates Containing other Anions
6 : Silicates with phosphate
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Type Occurrence of Nagelschmidtite

Type Locality:Hatrurim Formation, Negev, Israel
Year of Discovery:1977

Physical Properties of Nagelschmidtite

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

Crystallography of Nagelschmidtite

Crystal System:Hexagonal
Cell Parameters:a = 5.38Å, c = 7.1Å
Ratio:a:c = 1 : 1.32
Unit Cell Volume:V 177.97 ų (Calculated from Unit Cell)
Comment:Structure solution of synthetic sample gave P61, a = 10.82 Å, c = 21.46 Å (Sugiyama et al., 2010).

Optical Data of Nagelschmidtite

Type:Biaxial (+/-)
RI values: nα = 1.638 - 1.680 nβ = 1.652 - 1.698
Maximum Birefringence:δ = 1.638

Chart 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 Nagelschmidtite

Formula:
Ca
 
7
(SiO
 
4
)
 
2
(PO
 
4
)
 
2
Essential elements:Ca, O, P, Si
All elements listed in formula:Ca, O, P, Si
Common Impurities:Al,Fe,Cr,Mn,Mg,Na,K,P,S

Relationship of Nagelschmidtite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.HA.05Ertixiite
Na
 
2
Si
 
4
O
 
9
9.HA.10Kenyaite
Na
 
2
Si
 
22
O
 
41
(OH)
 
8
 · 6H
 
2
O
9.HA.20Wawayandaite
Ca
 
6
Mn
 
2
BBe
 
9
Si
 
6
O
 
23
(OH,Cl)
 
15
9.HA.25Magbasite
KBa(Al,Sc)(Mg,Fe)
 
6
Si
 
6
O
 
20
F
 
2
9.HA.30Afanasyevaite
Ca
 
8
[Si
 
2
O
 
7
]OCl
 
2
9.HA.40Igumnovite
Ca
 
3
Al
 
2
(SiO
 
4
)
 
2
Cl
 
4
9.HA.50Rudenkoite
Sr
 
3
(Al
 
3.5
Si
 
3.5
)O
 
10
(OH,O)
 
8
Cl
 
2
 · H
 
2
O
9.HA.55Foshallasite
Ca
 
3
[Si
 
2
O
 
7
] · 3H
 
2
O(?)
9.HA.65Caryochroite
(Na,Sr)
 
3
(Fe
3+
 
,Mg)
 
10
[(O,OH)
 
9
|Ti
 
2
Si
 
12
O
 
37
] · (H
 
2
O, O, OH)
 
17
9.HA.70Juanite
Ca
 
10
Mg
 
4
Al
 
2
Si
 
11
O
 
39
 · 4H
 
2
O or near
9.HA.75Tacharanite
Ca
 
12
Al
 
2
Si
 
18
O
 
51
 · 18H
 
2
O
9.HA.80Oyelite
Ca
 
10
Si
 
8
B
 
2
O
 
29
 · 12.5H
 
2
O
9.HA.85Denisovite
Ca
 
2
(K,Na)Si
 
3
O
 
8
(F,OH)
 
2
9.HA.90Tiettaite
(Na,K)
 
17
FeTiSi
 
16
O
 
29
(OH)
 
30
 · 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
17.6.2Perhamite
(Ca,Sr)
 
3
Al
 
7
(PO
 
4
)
 
4
(SiO
 
4
)
 
3
(OH)
 
3
 · 16.5H
 
2
O
17.6.3Viséite
17.6.4Phosinaite
17.6.5Clinophosinaite
Na
 
12
(Ca,Sr)
 
4
(Si
 
4
O
 
12
)(PO
 
4
)
 
4
17.6.6Karnasurtite-(Ce)
(Ce,La,Th)(Ti,Nb)(Al,Fe)(Si
 
2
O
 
7
)(OH)
 
4
 · 3H
 
2
O
17.6.7Lomonosovite
Na
 
5
Ti
 
2
(Si
 
2
O
 
7
)(PO
 
4
)O
 
2
17.6.8Bornemanite
Na
 
6
BaTi
 
2
Nb(Si
 
2
O
 
7
)
 
2
(PO
 
4
)O
 
2
(OH)F
17.6.9Sobolevite
Na
 
13
Ca
 
2
Mn
 
2
Ti
 
3
(Si
 
2
O
 
7
)
 
2
(PO
 
4
)
 
4
O
 
3
F
 
3
17.6.10Laplandite-(Ce)
Na
 
4
CeTiPO
 
4
Si
 
7
O
 
18
 · 5H
 
2
O
17.6.11 Vunonnemite
Na
 
5
TiNb
 
3
Si
 
6
O
 
25
F
 
2
 · 2Na
 
3
PO
 
4
17.6.12Saryarkite-(Y)
Ca(Y,Th)Al
 
5
(SiO
 
4
)
 
2
(PO
 
4
,SO
 
4
)
 
2
(OH)
 
7
 · 6H
 
2
O
17.6.13Steenstrupine-(Ce)
Na
 
14
Mn
2+
2
(Fe
3+
 
,Mn
3+
 
)
 
2
Ce
 
6
(Zr,Th)(Si
 
6
O
 
18
)
 
2
(PO
 
4
)
 
6
(HPO
 
4
)(OH)
 
2
 · 2H
 
2
O
17.6.14Waylandite
BiAl
 
3
(PO
 
4
)
 
2
(OH)
 
6
17.6.15Britholite-(Ce)
Ca
 
2
(Ce,Ca)
 
3
(SiO
 
4
,PO
 
4
)
 
3
(OH,F)
17.6.16Britholite-(Y)
Ca
 
2
(Y,Ca)
 
3
(SiO
 
4
,PO
 
4
)
 
3
(OH,F)
17.6.17Eylettersite
(Th,Pb)Al
 
3
(PO
 
4
,SiO
 
4
)
 
2
(OH)
 
6

Other Names for Nagelschmidtite

Other Languages:
German:Nagelschmidtit
Spanish:Nagelschmidtita

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 Nagelschmidtite

Reference List:

- +
Journal of Physical Chemistry 46 (1942), 747.

Mineralogical Magazine (1950): 29: 173.

Geological Survey of Israel, Bulletin 70 (1977).

American Mineralogist (1978): 63: 425-426.

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, p. 725.

Internet Links for Nagelschmidtite

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    • Localities for Nagelschmidtite

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    (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.
    Israel
     
    • Negev
    		Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
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