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Biachellaite

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Biachella Valley, Sacrofano, Sacrofano Caldera, Rome Province, Latium, Italy
© L.C. 2011




Formula:
(Na,Ca,K)
 
8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
 
2
(OH)
 
0.5
 · H
 
2
O
System:TrigonalColour:colourless
Hardness:5
Member of:Cancrinite Group
Name:Named for type locality, Biachella Valley, Italy


Cancrinite Group.

Classification of Biachellaite

IMA status:Approved 2007
Nickel-Strunz 10th (pending) edition ID:8.FB.05

8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
B : Polyphosphates, etc., with OH only
Dana 8th edition ID:76.2.9.19

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
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Type Occurrence of Biachellaite

Type Locality:Biachella Valley, Sacrofano, Sacrofano Caldera, Rome Province, Latium, Italy
General Appearance of Type Material:equant dipyramidal crystals up to 1 cm in cavities
Place of Conservation of Type Material:Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia (catalogue no.3642/1)
Geological Setting of type material:volcanic ejectum
Associated Minerals at type locality:
LeuciteHaüyneDiopsideAndradite

Physical Properties of Biachellaite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:colourless
Hardness (Mohs):5
Hardness Data:Measured
Cleavage:Perfect
perfect on {10-10}
Density (calculated):2.515 g/cm3

Crystallography of Biachellaite

Crystal System:Trigonal
Class (H-M):3 - Pyramidal
Space Group:P3
Cell Parameters:a = 12.913Å, c = 79.605Å
Ratio:a:c = 1 : 6.165
Unit Cell Volume:V 11495 ų
Z:15
X-Ray Powder Diffraction:
d-spacingIntensity
11.07 (19)
6.45 (18)
4.782 (15)
3.720 (100)
3.576 (18)
3.469 (14)
3.300 (47)
3.220 (16)

Chemical Properties of Biachellaite

Formula:
(Na,Ca,K)
 
8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
 
2
(OH)
 
0.5
 · H
 
2
O
Essential elements:Al, H, Na, O, S, Si
All elements listed in formula:Al, Ca, H, K, Na, O, S, Si

Relationship of Biachellaite to other Species

Member of:Cancrinite Group
Other Members of Group:

- +
Afghanite
(Na,Ca,K)
 
8
(Al
 
6
Si
 
6
O
 
24
)(Cl
 
2
,SO
 
4
,CO
 
3
)
 
3
 · 0.5H
 
2
O
Alloriite
(Na,Ca,K)
 
26
Ca
 
4
(Al
 
6
Si
 
6
O
 
24
)
 
4
(SO
 
4
)
 
6
Cl
 
6
Bystrite
(Na,K)
 
7
Ca(Al
 
6
Si
 
6
O
 
24
)(S
 
3
)
 
1.5
 · H
 
2
O
Cancrinite
(Na,Ca,☐)
 
8
(Al
 
6
Si
 
6
O
 
24
)(CO
 
3
,SO
 
4
)
 
2
 · 2H
 
2
O
Cancrisilite
Na
 
7
(Al
 
5
Si
 
7
O
 
24
)(CO
 
3
) · 3H
 
2
O
Davyne
(Na,K)
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(Cl
 
2
,SO
 
4
)
 
2
Depmeierite
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)(PO
 
4
,CO
 
3
)
 
1-x
 · 3H
 
2
O (x<0.5)
Franzinite
(Na,K)
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
 
2
 · 0.5H
 
2
O
Giuseppettite
(Na,K,Ca)
 
7-8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,Cl)
 
1-2
Hydroxycancrinite
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)(OH)
 
2
 · 2H
 
2
O
Kircherite
Na
 
5
Ca
 
2
K(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
 
2
 · 0.33H
 
2
O
Kyanoxalite
Na
 
7
(Al
 
6-x
Si
 
6+x
O
 
24
)(C
 
2
O
 
4
)
 
0.5+x
 · 5H
 
2
O (0 < x < 0.5)
Liottite
(Na,K)
 
16
Ca
 
8
(Al
 
6
Si
 
6
O
 
24
)
 
3
(SO
 
4
)
 
5
Cl
 
4
Marinellite
(Na,K)
 
42
Ca
 
6
(Al
 
6
Si
 
6
O
 
24
)
 
6
(SO
 
4
)
 
8
Cl
 
2
 · 3H
 
2
O
Microsommite
Na
 
4
K
 
2
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)Cl
 
2
Pitiglianoite
Na
 
6
K
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
) · 2H
 
2
O
Quadridavyne
(Na,K)
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)Cl
 
4
Sacrofanite
(Na,K)
 
98
Ca
 
20
(Al
 
6
Si
 
6
O
 
24
)
 
14
(SO
 
4
)
 
26
Cl
 
2
 · 8H
 
2
O
Tounkite
(Na,Ca,K)
 
8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
 
2
Cl · H
 
2
O
Vishnevite
(Na,K)
 
8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,CO
 
3
) · 2H
 
2
O

Other Names for Biachellaite

Synonyms:
IMA2007-044
Other Languages:

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 Biachellaite

Reference List:

- +
N. V. Chukanov, R. K, Rastsvetaeva, I. V. Pekov, A. E. Zadov, R. Allori, N. V. Subkova, G. Giester, D. Yu. Pushcharovky & K. V. Van (2008): Biachellaite (Na,Ca,K)8(Si6Al6O24)(SO4)2(OH)0.5.H2O, a new mineral of the cancrinite group. Proceedings of the Russian Mineralogical Society, 137(3), 57–66 (in Russian with English abstract).

Internet Links for Biachellaite

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    • Localities for Biachellaite

    Hide Locality List
    (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.
    Italy
     
    • Latium
      • Rome Province
        • Sacrofano Caldera
          • Sacrofano
    		Chukanov, N.V., et al., ZRMO 137(3),57-66(2008)
    Mineral and/or Locality
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