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Asbecasite

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Formula:
Ca3(Ti,Sn4+)Be2(AsO3)6(SiO4)2
System:
Trigonal
Colour:
Yellow, pale yellow
Hardness:
6½ - 7
Name:
Named by S. Graeser in 1966 for the elements in its composition: As, Be, Ca, Si.
This page provides mineralogical data about Asbecasite.

Classification of Asbecasite

Approved 1966
4.JB.30

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O
45.1.3.1

45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous
17.7.9

17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate
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Type Occurrence of Asbecasite

Year of Discovery:
1963
Geological Setting of Type Material:
Alpine veins.

Physical Properties of Asbecasite

Vitreous, Sub-Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Yellow, pale yellow
Streak:
Pale yellow
Hardness (Mohs):
6½ - 7
Tenacity:
Brittle
Cleavage:
Perfect
Rhombohedral {10-11}
Density:
3.70 g/cm3 (Measured)    3.71 g/cm3 (Calculated)

Crystallography of Asbecasite

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P3c1
Cell Parameters:
a = 8.364Å, c = 15.304Å
Ratio:
a:c = 1 : 1.83
Unit Cell Volume:
V 927.18 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tabular rhombohedral, sometimes equant.
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.04 (50)
3.84 (50)
3.23 (100)
2.41 (60)
1.75 (60)
1.57 (70)
1.32 (60)
1.15 (70)
Comments:
19-0087

Optical Data of Asbecasite

Type:
Uniaxial (-)
RI values:
nω = 1.860 nε = 1.830
Birefringence:
0.03
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Optical Extinction:
Parallel

Chemical Properties of Asbecasite

Formula:
Ca3(Ti,Sn4+)Be2(AsO3)6(SiO4)2
Essential elements:
All elements listed in formula:

Relationship of Asbecasite to other Species

4.JB.05Fetiasite(Fe3+,Fe2+,Ti)3(As2O5)O2
4.JB.10ManganarsiteMn3(As2O4)(OH)4
4.JB.15MagnussoniteMn10As6O18(OH,Cl)2
4.JB.15UM1984-09-AsO:ClHMnMn10As6O18(OH)Cl
4.JB.20ArmangiteMn262+(AsO3)14(HAsO3)4(CO3)
4.JB.25NanlingiteNa(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14
4.JB.35StenhuggariteCaFeSb(AsO3)2O
4.JB.40TrigonitePb3Mn2+(AsO3)2(HAsO3)
4.JB.45FinnemanitePb5(AsO3)3Cl
4.JB.50GebharditePb8(As2O5)2OCl6
4.JB.55DerbyliteFe43+Ti3Sb3+O13(OH)
4.JB.55Tomichite(V,Fe)4Ti3AsO13(OH)
4.JB.55Graeserite(Fe3+,Ti)4Ti3AsO13(OH)
4.JB.60Hemloite(Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH)
4.JB.65FreediteCu+Pb8(AsO3)2O3Cl5
4.JB.70GeorgiadèsitePb4(AsO3)Cl4(OH)
4.JB.75Ekatite(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6
17.7.1SuzukiiteBaVSi2O7
17.7.2FranciscaniteMn62+(V5+,☐)2(SiO4)2(O,OH)6
17.7.3Kurumsakite(Zn,Ni,Cu)8Al8V25+Si5O35 · 27H2O (?)
17.7.4Ardennite-(As)Mn42+Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6
17.7.5Medaite(Mn,Ca)6(V,As)Si5O18OH
17.7.6JohninnesiteNa2Mn92+Mg7(OH)8[AsO4]2[Si6O17]2
17.7.7TiragalloiteMn42+(HAsSi3O13)
17.7.8DixeniteCuMn142+Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6
17.7.10McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21
17.7.11KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16
17.7.12Schallerite(Mn,Fe)16Si12As3O36(OH)17
17.7.13Nelenite(Mn,Fe)16(Si12O30)(OH)14[As33+O6(OH)3]
17.7.14KoliciteMn72+Zn4(AsO4)2(SiO4)2(OH)8
17.7.15YeatmaniteZn6Mn92+Sb25+(SiO4)4O12
17.7.16WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]
17.7.17Katoptrite(Mn2+,Mg)13(Al,Fe3+)4Sb25+(SiO4)2O20
17.7.18ParweliteMn10Sb2As2Si2O24
17.7.19Långbanite(Mn2+,Ca)4(Mn3+,Fe3+)9Sb5+(SiO4)2O16
17.7.20ChapmaniteFe23+Sb3+(Si2O5)O3(OH)
17.7.21Cervandonite-(Ce)(Ce,Nd,La)(Fe3+,Fe2+,Ti,Al)3O2(Si2O7)(As3+O3)(OH)

Other Names for Asbecasite

Name in Other Languages:

Other Information

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 Asbecasite

Reference List:
American Mineralogist: 52: 1583.

American Mineralogist: 55: 1818.

Mineralogical Magazine: 57: 315-322.

Internet Links for Asbecasite

Localities for Asbecasite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
    • Viterbo Province
      • Vico Lake
        • Vetralla
A. Maras et al. , Eur. J. Mineral. , 1995, 7, pp. 439-446.
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Ossola Valley
        • Antigorio Valley
          • Devero Valley
            • Baceno
              • Devero Alp
Guastoni, A., Pezzotta, F., Vignola, P. (2006): Characterization and genetic inferences of arsenates, sulfates and vanadates of Fe, Cu, Pb, Zn from Mount Cervandone (Western Alps, Italy). Periodico di Mineralogia, 76, 141-150.
Norway
 
  • Nordland
    • Sørfold
Ellingsen, H.V., Haugen, A., Raade, G., Eldjarn, K. & Berg, H.-J., (1995): Sjeldne mineraler i en amazonittpegmatitt ved Tennvatn i Nordland. Norsk Bergverksmuseums Skriftserie 9, 35-37
Switzerland
 
  • Wallis (Valais)
    • Binn Valley
      • Chummibort
Cuchet, S., van der Burgt, A. und Meisser, N. (2005): Chummibort, eine neue Fundstelle für Arsenmineralien im Binntal. Schweizer Strahler, Nr. 2, 19-29. (in German/French)
      • Kriegalp Valley (Chriegalp Valley)
Schweiz.Min.Petr.Mitt.(1966) 46, 367-375
      • Lercheltini area (Lärcheltini)
[MinRec 27:302]; American Mineralogist, Volume 79, pages 996-1002, 1994
    • Brig
      • Simplon pass area
        • Steinu Valley
Christian Bracke Collection.
Mineral and/or Locality  
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