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Magnanelliite

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Formula:
K3Fe3+2(SO4)4(OH)(H2O)2
Colour:
yellow to orange‐yellow
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
s 2.82
Crystal System:
Monoclinic
Name:
The name honors Stefano Magnanelli (b. 1959), chemist and mineral collector, for his contributions to the knowledge of the mineralogy of the Apuan Alps hydrothermal veins. He coauthored the type description of bottinoite and provided the first specimens of parasterryit and bianchiniite, as well as several samples from the Carrara marble quarries and other mining sites of the Apuan Alps, supporting the mineralogical studies of these occurrences.
The Fe3+ analogue of alcaparrosaite.


Hide all sections | Show all sections

Classification of MagnanelliiteHide

Approved
Approval Year:
2019

Physical Properties of MagnanelliiteHide

Vitreous
Transparency:
Transparent
Colour:
yellow to orange‐yellow
Streak:
pale yellow
Hardness:
Tenacity:
Brittle
Cleavage:
Distinct/Good
good on {010}, fair on {100}.
Fracture:
Irregular/Uneven, Conchoidal
Density:
s 2.82(3) g/cm3 (Measured)    

Optical Data of MagnanelliiteHide

Type:
Biaxial (+)
RI values:
nα = 1.628(2) nβ = 1.637(2) nγ = 1.665(2)
2V:
Measured: 60° (2), Calculated: 59.9°
Max Birefringence:
δ = 0.037
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong dispersion, r > v
Pleochroism:
Visible
Comments:
X = orange yellow, Y and Z = yellow

Chemical Properties of MagnanelliiteHide

Formula:
K3Fe3+2(SO4)4(OH)(H2O)2

Crystallography of MagnanelliiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 7.5491(3) Å, b = 16.8652(6) Å, c = 12.1574(4) Å
β = 94.064(1)°
Ratio:
a:b:c = 0.448 : 1 : 0.721
Unit Cell V:
1,543.95 ų (Calculated from Unit Cell)
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.9Å(m)
4.91Å(mw)
3.612Å(mw)
3.427Å(mw)
3.300Å(mw)
3.085Å(s)
3.006Å(m)
2.704Å(m)
Comments:
From Type Description.

Occurrences of MagnanelliiteHide

Paragenetic Mode(s):
•  Oxidation

Type Occurrence of MagnanelliiteHide

General Appearance of Type Material:
steeply terminated prisms, up to 0.5 mm in length
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Museo di Storia Naturale,Università di Pisa, Via Roma 79, Calci (Pisa, Italy), catalogue number 19894 (holotype), and the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 67241 (cotype)
Geological Setting of Type Material:
Oxidation of pyrite orebody
Associated Minerals at Type Locality:
Reference:
Biagioni, C.; Bindi, L.; Kampf, A.R. (2019) Crystal-Chemistry of Sulfates from the Apuan Alps (Tuscany, Italy). VII. Magnanelliite, K3Fe3+2(SO4)4 (OH)(H2O)2, a New Sulfate from the Monte Arsiccio Mine. Minerals 9, 779.

Synonyms of MagnanelliiteHide

Fluorescence of MagnanelliiteHide

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 MagnanelliiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Biagioni, C., Bindi, L. and Kampf, A.R. (2019) Magnanelliite, IMA 2019-006. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83: 323–328.
Biagioni, C.; Bindi, L.; Kampf, A.R. (2019) Crystal-Chemistry of Sulfates from the Apuan Alps (Tuscany, Italy). VII. Magnanelliite, K3Fe3+2(SO4)4 (OH)(H2O)2, a New Sulfate from the Monte Arsiccio Mine. Minerals 9, 779.

Internet Links for MagnanelliiteHide

Localities for MagnanelliiteHide

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
      • Stazzema
        • Sant'Anna di Stazzema
Biagioni, C., Bindi, L. and Kampf, A.R. (2019) Magnanelliite, IMA 2019-006. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83: 323–328. ; Biagioni C, Bindi L, Mauro D, Hålenius U. (2019) Crystal Chemistry of Sulfates from the Apuan Alps (Tuscany, Italy). V. Scordariite, K8(Fe3+0.67□0.33)[Fe3+3O(SO4)6(H2O)3]2(H2O)11: A New Metavoltine-Related Mineral. Minerals. 9(11):702.
 
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