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Gianellaite

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Formula:
[(NHg2)2](SO4)(H2O)x
Colour:
Translucent straw-yellow
Hardness:
3
Specific Gravity:
7.19
Crystal System:
Isometric
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.



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Classification of GianellaiteHide

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

Physical Properties of GianellaiteHide

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

Optical Data of GianellaiteHide

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

Chemical Properties of GianellaiteHide

Formula:
[(NHg2)2](SO4)(H2O)x
IMA Formula:
[(NHg2)2](SO4)(H2O)x, x~0

Crystallography of GianellaiteHide

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

Type Occurrence of GianellaiteHide

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:

Synonyms of GianellaiteHide

Other Language Names for GianellaiteHide

German:Gianellait
Spanish:Gianellaita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calomel1 photo of Gianellaite associated with Calomel on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.DD.05Eglestonite(Hg2+2)3OCl3(OH)Iso. m3m (4/m 3 2/m) : Ia3d
3.DD.05Kadyrelite(Hg2+2)3OBr3(OH)Iso.
3.DD.10Poyarkovite(Hg2+2)3Cl2O2Mon. 2/m : B2/b
3.DD.15Hanawaltite(Hg2+2)3Hg2+(Cl,OH)2O3Orth. mmm (2/m 2/m 2/m)
3.DD.20Terlinguaite(Hg2+2)Hg2+2Cl2O2Mon. 2/m : B2/m
3.DD.25PinchiteHg2+5Cl2O4Orth.
3.DD.30Mosesite(Hg2N)(Cl,SO4,MoO4) · H2OIso.
3.DD.35Kleinite(Hg2N)(Cl,SO4) · nH2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.DD.40Tedhadleyite(Hg+2)5Hg2+I2(Cl,Br)2O4Tric.
3.DD.45Vasilyevite(Hg+2)10I3Br2Cl(CO3)O6Tric. 1 : P1
3.DD.50Aurivilliusite(Hg+2)0.5Hg2+(I,Br,Cl)OMon. 2/m : B2/b
3.DD.55TerlinguacreekiteHg2+3Cl2O2Orth.
3.DD.60Kelyanite(Hg+2)6Sb3+BrCl2O6Mon.
3.DD.65ComancheiteHg2+55N3–24(NH2,OH)4(Cl,Br)34Orth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

25.5.1ZinkositeZnSO4Orth.
25.5.2GoslariteZnSO4 · 7H2OOrth. 2 2 2 : P21 21 21
25.5.3NamuwiteZn4(SO4)(OH)6 · 4H2OTrig. 3 : P3
25.5.4KtenasiteZn(Cu,Zn)4(SO4)2(OH)6 · 6H2OMon.
25.5.5Ramsbeckite(Cu,Zn)15(SO4)4(OH)22 · 6H2OMon. 2/m
25.5.6Boyleite(Zn,Mg)SO4 · 4H2OMon. 2/m : P21/b
25.5.7SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2OMon. 2/m : B2/b
25.5.8OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2OOrth. mm2 : Pca21
25.5.9ZincaluminiteZn6Al6(SO4)2(OH)16 · 5H2O
25.5.10Glaucocerinite(Zn1-xAlx)(OH)2(SO4)x/2 · nH2OHex.
25.5.11GunningiteZnSO4 · H2OMon. 2/m : B2/b
25.5.12ChaidamuiteZnFe3+(SO4)2(OH) · 4H2OTric. 1 : P1
25.5.13Bianchite(Zn,Fe)SO4 · 6H2OMon. 2/m : P2/m
25.5.15Zincmelanterite(Zn,Cu,Fe)SO4 · 7H2OMon.
25.5.16Zincobotryogen(Zn,Mg,Mn2+)Fe3+(SO4)2(OH) · 7H2OMon. 2/m
25.5.17SchuetteiteHg2+3(SO4)O2Trig. 3 2 : P31 2 1

Other InformationHide

Notes:
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 GianellaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 GianellaiteHide

Localities for GianellaiteHide

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.
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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