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Mapiquiroite

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Formula:
(Sr,Pb)(U,Y)Fe2(Ti,Fe3+,Cr3+)18O38
Colour:
Black
Lustre:
Sub-Metallic
Hardness:
6
Crystal System:
Trigonal
Name:
Named in honour of four Italian mineral collectors, Riccardo Mazzanti, Luigi Pierotti, Ugo Quilici, and Moreno Romani for their contribution to the study of the mineralogy of baryte + pyrite + iron oxide deposits from the Apuan Alps.
Unique combination of elements. The Sr analogue of cleusonite and U analogue of crichtonite.


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Classification of MapiquiroiteHide

Approved
Approval Year:
2013
4.00.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
0 :
0 :

Physical Properties of MapiquiroiteHide

Sub-Metallic
Colour:
Black
Hardness:
Hardness:
VHN100=750 - 782 - Vickers

Optical Data of MapiquiroiteHide

Type:
Anisotropic
Anisotropism:
Distinct, without characteristic rotation tints.
Bireflectance:
Weakly bireflectant
Reflectivity:
471.1nmR1=17.0%R2=17.2%
548.3nmR1=16.7%R2=17.0%
586.6nmR1=16.4%R2=16.7%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 17.2%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Blackish
Internal Reflections:
Absent
Pleochroism:
Non-pleochroic

Chemical Properties of MapiquiroiteHide

Formula:
(Sr,Pb)(U,Y)Fe2(Ti,Fe3+,Cr3+)18O38
Common Impurities:
Pb,Y,V(V),Cr,Mn,La

Crystallography of MapiquiroiteHide

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 10.3719(7) Å, c = 20.875(1) Å
Ratio:
a:c = 1 : 2.013
Unit Cell V:
1,944.79 ų (Calculated from Unit Cell)
Morphology:
Complex rhombohedral or tabular pseudo-hexagonal crystals; tabular pseudo-hexagonal crystals.
Comment:
Buca della Vena

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.81(76)
5.18(100)
4.51(44)
3.404(41)
2.994(35)
Comments:
From Type Description. Buca della Vena

Type Occurrence of MapiquiroiteHide

General Appearance of Type Material:
Complex rhombohedral or tabular pseudo-hexagonal crystals, up to 1mm in size ((Buca della Vena). Tabular pseudo-hexagonal crystals, up to 5mm in size (Monte Arsiccio).
Place of Conservation of Type Material:
Type material is deposited in the collections of the collections of the Museo di Storia Naturale, Universita` di Pisa, Via Roma 79, Calci (Pisa), Italy, catalogue numbers 18837 (Buca della Vena) and 19650 (Monte Arsiccio)
Geological Setting of Type Material:
Quartz-adularia-baryte veins embedded in schists (Buca della Vena). Quartz-carbonate veins embedded in magnetite-rich dolostones(Monte Arsiccio).
Associated Minerals at Type Locality:

Synonyms of MapiquiroiteHide

Other Language Names for MapiquiroiteHide

Relationship of Mapiquiroite to other SpeciesHide

Other Members of this group:
AlmeidaitePbZn2(Mn,Y)(Ti,Fe3+)18O37(OH,O)Trig. 3 : R3
Cleusonite(Pb,Sr)(U4+,U6+)(Fe2+,Zn)2(Ti,Fe2+,Fe3+)18(O,OH)38Trig. 3 : R3
CrichtoniteSr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38Trig. 3 : R3
Davidite-(Ce)(Ce,La)(Y,U,Fe)(Ti,Fe)20(O,OH)38Trig. 3 : R3
Davidite-(La)(La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38Trig.
Davidite-(Y)(La,Ce,Na,Ca,Pb)(Y,Fe2+,◻)(Fe2+,Mn2+)2(Ti,Fe3+,Nb,Zr)18O38 (hypothetical)Trig.
Dessauite-(Y)(Sr,Pb)(Y,U)(Ti,Fe3+)20O38Trig. 3 : R3
Gramaccioliite-(Y)(Pb,Sr)(Y,Mn)Fe3+2(Ti,Fe3+)18O38Trig. 3
LandauiteNaMnZn2(Ti,Fe)6Ti12O38Trig. 3 : R3
Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38Trig.
Loveringite(Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38Trig.
Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38Trig.
Mianningite(◻,Pb,Ce,Na)(U4+,Mn,U6+)Fe3+2 (Ti,Fe3+)18O38Trig. 3 : R3
PaseroitePbMn2+(Mn2+,Fe3+)2(V5+,Ti,◻)18O38 Trig. 3 : R3
SenaitePb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38Trig.
UM1987-03-O:FePbTiU~(U,Pb)(Ti,Fe3+,Fe2+,Mn)21O38Trig. 3 : R3
Unnamed (HBU UK-4)NaFe2+Zn2(Ti,Fe3+,Nb)6Ti12O38Trig. 3 : R3

Related Minerals - Nickel-Strunz GroupingHide

4.00.Goethiteα-Fe3+O(OH)Orth. mmm (2/m 2/m 2/m)
4.00.Microlite GroupIso. m3m (4/m 3 2/m) : Fd3m
4.00.Ferrotaaffeite-6N'3S(Be,Zn,Mg)FeAl4O8Trig.
4.00.Pyrochlore GroupA2Nb2(O,OH)6Z
4.00.Roméite Group
4.00.Ferrohögbomite-2N2S[(Fe2+,Mg,Zn,Al)3(Al,Ti,Fe3+)8O15(OH)]2Hex. 6mm : P63mc
4.00.Písekite-(Y)(Y,As,Ca,Fe,U)(Nb,Ti,Ta)O4
4.00.UM2004-19-O:AlCeGdZr(Gd,Ce)4Al2Zr4O17
4.00.UM2004-21-O:CaFeGdZrCa2Gd4Fe5ZrO15
4.00.UM2004-27-O:GdTiGd2Ti4O11
4.00.AlmeidaitePbZn2(Mn,Y)(Ti,Fe3+)18O37(OH,O)Trig. 3 : R3
4.00.VapnikiteCa2CaUO6Mon. 2/m

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 MapiquiroiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Biagioni, C., Orlandi, P., Pasero, M., Nestola, F. and Bindi, L. (2013) Mapiquiroite, IMA 2013-010. CNMNC Newsletter No. 16, August 2013, page 2703; Mineralogical Magazine, 77, 2695-2709.
Biagioni, C., Orlandi, P., Pasero, M., Nestola, F., Bindi, L. (2014): Mapiquiroite, (Sr,Pb)(U,Y)Fe2(Ti,Fe3+)18O38, a new member of the crichtonite group from the Apuan Alps, Tuscany, Italy. European Journal of Mineralogy, 26, 427-437.

Internet Links for MapiquiroiteHide

Localities for MapiquiroiteHide

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.
Italy (TL)
 
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Stazzema
          • Ponte Stazzemese
Biagioni, C., Orlandi, P., Pasero, M., Nestola, F. and Bindi, L. (2013) Mapiquiroite, IMA 2013-010. CNMNC Newsletter No. 16, August 2013, page 2703;Biagioni, C., Orlandi, P., Pasero, M., Nestola, F., Bindi, L. (2014): Mapiquiroite, (Sr,Pb)(U,Y)Fe2(Ti,Fe3+)18O38, a new member of the crichtonite group from the Apuan Alps, Tuscany, Italy. European Journal of Mineralogy, 26, 427-437. Mineralogical Magazine, 77, 2695-2709.
          • Sant'Anna di Stazzema
Biagioni, C., Orlandi, P., Pasero, M., Nestola, F. and Bindi, L. (2013) Mapiquiroite, IMA 2013-010. CNMNC Newsletter No. 16, August 2013, page 2703; Mineralogical Magazine, 77, 2695-2709. ; Biagioni, C., Orlandi, P., Pasero, M., Nestola, F., Bindi, L. (2014): Mapiquiroite, (Sr,Pb)(U,Y)Fe2(Ti,Fe3+)18O38, a new member of the crichtonite group from the Apuan Alps, Tuscany, Italy. European Journal of Mineralogy, 26, 427-437.
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