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Huizingite-(Al)

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About Huizingite-(Al)Hide

Terry and Marie Huizing
Formula:
[(NH4)9(SO4)2][(Al,Fe3+)3(OH)2(H2O)4(SO4)6]
Colour:
light greenish-yellow
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.026 (Calculated)
Crystal System:
Triclinic
Name:
Huizingite is named for Terry E. Huizing (born 1938), Adjunct Curator of Mineralogy for the Cincinnati Museum Center, and Marie E. Huizing (born 1939), Editor of Rocks & Minerals since 1978.
New structure type. The first NH4-Al sulphate that is both basic and hydrated. Somewhat chemically comparable to ammonioalunite and tschermigite. Some analyses have Fe > Al, thus corresponding to 'unnamed (Fe analogue of huizingite-(Al))'.

The bipartite (as in case of carlsonite of the same locality) structure consist of:
- [(Al,Fe3+)3(OH)2(H2O)4(SO4)6]5- cluster, comprising the structural unit, and being unique (the comparable unit in carlsonite has the same charge), although of the samer topology as a fragment of a chain in sideronatrite
- [(NH4)9(SO4)2]5+ complex, comprising the interstitial unit.
In the structural unit three (Al,)FeO6 octahedra form a corner-linked chain.


Classification of Huizingite-(Al)Hide

Approved
Approval Year:
2015

Physical Properties of Huizingite-(Al)Hide

Vitreous
Colour:
light greenish-yellow
Streak:
white
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.026 g/cm3 (Calculated)

Optical Data of Huizingite-(Al)Hide

Type:
Biaxial (+)
RI values:
nα = 1.543(1) nβ = 1.545(1) nγ = 1.563(1)
2V:
Measured: 40° (3), Calculated: 37°
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
strong (r > v)
Comments:
pale yellow (X), almost colourless (Y & Z); X > Y ~ Z

Chemical Properties of Huizingite-(Al)Hide

Formula:
[(NH4)9(SO4)2][(Al,Fe3+)3(OH)2(H2O)4(SO4)6]
IMA Formula:
(NH4)9Al3(SO4)8(OH)2 · 4H2O
Common Impurities:
Fe(III)

Crystallography of Huizingite-(Al)Hide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 9.7093(3) Å, b = 10.4341(3) Å, c = 10.7027(8) Å
α = 77.231(5)°, β = 74.860(5)°, γ = 66.104(5)°
Ratio:
a:b:c = 0.931 : 1 : 1.026
Unit Cell V:
948.73 ų
Z:
1
Morphology:
Observed crystal forms: {100}, {010}, {110}
Twinning:
not observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.82(60)
5.60(32)
5.037(69)
4.122(41)
3.534(38)
3.427(100)
3.204(68)
3.043(94)
Comments:
From Type Description.

Type Occurrence of Huizingite-(Al)Hide

General Appearance of Type Material:
tabular to bladed crystals, flattening on {100} , up to ca. 0.25 mm (in max. dimension), in drusy aggregates
Place of Conservation of Type Material:
Type material is deposited in the collections of Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 65576
Geological Setting of Type Material:
as for carslonite: natural fire of an oil-bearing shale

Synonyms of Huizingite-(Al)Hide

Other InformationHide

Notes:
easily soluble in water; Lewis basicity: (1) structural unit: 0.20-0.12 valence units (vu); (2) interstitial complex: 0.14 vu;

Raman bands [cm-1]: 980, 1003, 1010, 1027 (sulfate symmetric stretching); 1064, 1123, 1151, 1205 (ν3 sulfate modes); 618-673 region (ν4 sulfate modes); 448-478 region (ν2 sulfate modes); 223, 263 (Fe-O modes?)
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 Huizingite-(Al)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Richards, R.P., Nash, B.P., Rakovan, J. and Murowchick, J.B. (2015) Huizingite-(Al), IMA 2015-014. CNMNC Newsletter No. 25, June 2015, page 534; Mineralogical Magazine, 79, 529-535.
Kampf, A.R., Richards, R.P., Nash, B.P., Murowchick, J.B., Rakovan, J.R. (2016): Carlsonite, (NH4)5Fe3+3O(SO4)6·7H2O, and huizingite-(Al) (NH4)9Al3(SO4)8(OH)2·4H2O, two new minerals from a natural fire in an oil-bearing shale near Milan, Ohio. American Mineralogist, 101, 2095-2107.

Internet Links for Huizingite-(Al)Hide

Localities for Huizingite-(Al)Hide

ⓘ - 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
 
  • Campania
    • Phlegrean Volcanic Complex
      • Naples Province
        • Phlegrean Fields
          • Pozzuoli
            • Solfatara di Pozzuoli
- Russo, M., Campostrini, I., Demartin, F. (2017): I minerali di origine fumarolica dei Campi Flegrei: Solfatara di Pozzuoli (Napoli) e dintorni. Micro, 15, 122-192.
USA (TL)
 
  • Ohio
    • Huron Co.
      • Huron River
Kampf, A.R., Richards, R.P., Nash, B.P., Rakovan, J. and Murowchick, J.B. (2015) Huizingite-(Al), IMA 2015-014. CNMNC Newsletter No. 25, June 2015, page 534; Mineralogical Magazine, 79, 529-535.
Mineral and/or Locality  
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