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Gianellaite

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Formula:
[(NHg2)2](SO4)(H2O)x
System:
Isometric
Colour:
Translucent straw-yellow
Hardness:
3
Name:
Professor Emeritus Vincent Paul Gianella (February 9, 1886 in Marysville, California - Auburn, California on July 9, 1983), Mackay School of Mines, University of Nevada
Although somewhat chemically similar to kleinite and mosesite, gianellaite has a unique combination of dominant elements.

In the structure there are: (1) nitrogen-centered (NHg4)5+ tetrahedra, that have all corners common; (2) interstitial sulfate tetrahedra, in ordered set but disordered orientation.

Classification of Gianellaite

Approved
Approval Year:
1972
3.DD.30

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
D : With Hg
28.2.4.1

28 : ANHYDROUS ACID AND NORMAL SULFATES
2 : A2XO4
25.5.18

25 : Sulphates
5 : Sulphates of Zn and Hg
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Type Occurrence of Gianellaite

General Appearance of Type Material:
rosettes of flattened subhedral crystals, rarely as euhedral crystals 0.2-1.0 mm. in diameter of distorted octahedra
Place of Conservation of Type Material:
Smithsonian Institution, Washington
Geological Setting of Type Material:
Oxidation zone of hydrothermal mercury deposit
Associated Minerals at Type Locality:

Physical Properties of Gianellaite

Colour:
Translucent straw-yellow
Hardness (Mohs):
3
Density:
7.19 g/cm3 (Measured)    7.13 g/cm3 (Calculated)

Crystallography of Gianellaite

Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
F4 3m
Space Group Setting:
F4 3m
Cell Parameters:
a = 9.5215Å
Unit Cell Volume:
V 863.1 ų
Z:
4

Optical Data of Gianellaite

Type:
Isotropic
RI values:
n = 2.085
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Very High

Chemical Properties of Gianellaite

Formula:
[(NHg2)2](SO4)(H2O)x
All elements listed in formula:

Relationship of Gianellaite to other Species

3.DD.05Eglestonite(Hg22+)3OCl3(OH)
3.DD.05Kadyrelite(Hg22+)3OBr3(OH)
3.DD.10Poyarkovite(Hg22+)3Cl2O2
3.DD.15Hanawaltite(Hg22+)3Hg2+(Cl,OH)2O3
3.DD.20Terlinguaite(Hg22+)Hg22+Cl2O2
3.DD.25PinchiteHg52+Cl2O4
3.DD.30Mosesite(Hg2N)(Cl,SO4,MoO4) · H2O
3.DD.35Kleinite(Hg2N)(Cl,SO4) · nH2O
3.DD.40Tedhadleyite(Hg2+)5Hg2+I2(Cl,Br)2O4
3.DD.45Vasilyevite(Hg2+)10I3Br2Cl(CO3)O6
3.DD.50Aurivilliusite(Hg2+)0.5Hg2+(I,Br,Cl)O
3.DD.55TerlinguacreekiteHg32+Cl2O2
3.DD.60Kelyanite(Hg2+)6Sb3+BrCl2O6
3.DD.65ComancheiteHg552+N243–(NH2,OH)4(Cl,Br)34
25.5.1ZinkositeZnSO4
25.5.2GoslariteZnSO4 · 7H2O
25.5.3NamuwiteZn4(SO4)(OH)6 · 4H2O
25.5.4KtenasiteZn(Cu,Zn)4(SO4)2(OH)6 · 6H2O
25.5.5Ramsbeckite(Cu,Zn)15(SO4)4(OH)22 · 6H2O
25.5.6Boyleite(Zn,Mg)SO4 · 4H2O
25.5.7SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
25.5.8OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
25.5.9ZincaluminiteZn6Al6(SO4)2(OH)16 · 5H2O
25.5.10Glaucocerinite(Zn1-xAlx)(OH)2(SO4)x/2 · nH2O
25.5.11GunningiteZnSO4 · H2O
25.5.12ChaidamuiteZnFe3+(SO4)2(OH) · 4H2O
25.5.13Bianchite(Zn,Fe)SO4 · 6H2O
25.5.15Zincmelanterite(Zn,Cu,Fe)SO4 · 7H2O
25.5.16Zincobotryogen(Zn,Mg,Mn2+)Fe3+(SO4)2(OH) · 7H2O
25.5.17SchuetteiteHg32+(SO4)O2

Other Names for Gianellaite

Name in Other Languages:
German:Gianellait
Spanish:Gianellaita

Other Information

Other Information:
Decomposed by conc. HCl at room temperature
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 Gianellaite

Reference List:
Tunell, G., Fahey, J.J., Daugherty, F.W., Gibbs, G.V. (1977) Gianellaite, a new mercury mineral. Neues Jahrbuch für Mineralogie, Monatshefte, 119-131.

Fleischer, M., Pabst, A., Mandarino, J.A., Chao, G.Y. (1977) New Mineral Names. American Mineralogist, 62, 1057-1061.

Cooper, M.A., Abdu, Y.A., Hawthorne, F.C., Kampf, A.R. (2016): The crystal structure of gianellaite, [(NHg2)2](SO4)(H2O)x, a framework of (NHg4) tetrahedra with ordered (SO4) groups in the interstices. Mineralogical Magazine: 80 (in press).

Internet Links for Gianellaite

Localities for Gianellaite

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.
USA
 
  • California
    • San Benito Co.
      • Diablo Range
        • New Idria District
          • Picacho Peak
Dunning, Hadley, Cooper, Magnasco collections; Mineralogical Record (1993): 24: 471-475.
  • Texas
    • Brewster Co.
      • Terlingua District
Neues Jahrb. Min., Mh. (1977): 119-131.
Mineral and/or Locality  
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