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Jerrygibbsite

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Formula:
Mn92+(SiO4)4(OH)2
System:
Orthorhombic
Colour:
Violet pink to pinkish ...
Hardness:
Name:
Named by Pete J. Dunn, Donald R. Peacor, William B. Simmons, and Eric J. Essene in 1984 in honor of Professor Gerald "Jerry" V. Gibbs [1929- ] mineralogist, Virginia Polytechnic Institute. Blacksburg, Virginia, USA.
Light to medium pinkish violet massive mineral with franklinite, willemite, and zincite. Not found with any calcite at the type location. Physically resembles leucophoenicite, sonolite, and other members of its group. It is not possible to sight identify this species. Each specimen requires verification. Numerous fakes are known. At the type locality, the mineral was found in very few specimens. X-ray diffraction may be used to identify the species in conjunction with a chemical analysis. Caution: jerrygibbsite shares many of the same d lines as other humites, but the calculated cell dimensions are based on a super-cell relationship.

Classification of Jerrygibbsite

Approved 1981
8/B.04-100
9.AF.70

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
52.3.2d.2

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
14.17.7

14 : Silicates not Containing Aluminum
17 : Silicates of Mn
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Type Occurrence of Jerrygibbsite

General Appearance of Type Material:
Massive to granular-appearing light to medium pink violet mineral.
Place of Conservation of Type Material:
Smithsonian Institution
Year of Discovery:
1981
Geological Setting of Type Material:
Metamorphosed manganese-bearing zinc silicate and zinc oxide ore deposit.
Associated Minerals at Type Locality:

Occurrences of Jerrygibbsite

Geological Setting:
Manganese silicate deposit where it was originally found as an indistinguishable mixture of several humite group species.

Physical Properties of Jerrygibbsite

Sub-Vitreous, Resinous
Diaphaneity (Transparency):
Translucent
Comment:
Said to be vitreous on cleavage surfaces, but usually dull resinous.
Colour:
Violet pink to pinkish violet
Comment:
Not rosey pink as in leucophoenicite
Streak:
Pale pink
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Parallel to {001}
Fracture:
Irregular/Uneven
Comment:
Cleavage is not obvious
Density:
4.00 g/cm3 (Measured)    4.07 g/cm3 (Calculated)

Crystallography of Jerrygibbsite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcn
Cell Parameters:
a = 4.85Å, b = 10.7Å, c = 28.17Å
Ratio:
a:b:c = 0.453 : 1 : 2.633
Unit Cell Volume:
V 1,461.88 ų (Calculated from Unit Cell)
Morphology:
Massive.
Comment:
Setting is Pbn21
X-Ray Powder Diffraction Data:
d-spacingIntensity
2.87 (80)
2.75 (50)
2.70 (50)
2.66 (30)
2.56 (10)
2.36 (40)
1.810 (100)
1.550 (30)

Optical Data of Jerrygibbsite

Type:
Biaxial (-)
RI values:
nα = 1.772 nβ = 1.783 nγ = 1.789
2V:
Measured: 72° , Calculated: 72°
Birefringence:
0.027
Max Birefringence:
δ = 0.017
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v moderate
Optical Extinction:
Parallel. abc = XYZ
Pleochroism:
Non-pleochroic

Chemical Properties of Jerrygibbsite

Formula:
Mn92+(SiO4)4(OH)2
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,Zn,Mg,Ca,H2O

Relationship of Jerrygibbsite to other Species

Other Members of Group:
LeucophoeniciteMn72+(SiO4)3(OH)2
Ribbeite(Mn2+,Mg)5(SiO4)2(OH)2
Common Associates:
9.AF.05SillimaniteAl2(SiO4)O
9.AF.10AndalusiteAl2(SiO4)O
9.AF.10KanonaiteMn3+Al(SiO4)O
9.AF.15KyaniteAl2(SiO4)O
9.AF.20MulliteAl4+2xSi2-2xO10-x
9.AF.20Krieselite(Al,Ga)2(GeO4)(OH)2
9.AF.23BoromulliteAl9BSi2O19
9.AF.25YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)
9.AF.30MagnesiostauroliteMg(Mg,Li)3(Al,Mg)18Si8O44(OH)4
9.AF.30StauroliteFe22+Al9Si4O23(OH)
9.AF.30ZincostauroliteZn2Al9Si4O23(OH)
9.AF.35TopazAl2(SiO4)(F,OH)2
9.AF.40NorbergiteMg3(SiO4)(F,OH)2
9.AF.45AlleghanyiteMn52+(SiO4)2(OH)2
9.AF.45Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2
9.AF.45ReinhardbraunsiteCa5(SiO4)2(OH,F)2
9.AF.45KumtyubeiteCa5(SiO4)2F2
9.AF.45HydroxylchondroditeMg5(SiO4)2(OH)2
9.AF.50Humite(Mg,Fe2+)7(SiO4)3(F,OH)2
9.AF.50Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
9.AF.50Unnamed (Ca-analogue of Humite)Ca7(SiO4)4F2
9.AF.55ClinohumiteMg9(SiO4)4F2
9.AF.55SonoliteMn92+(SiO4)4(OH,F)2
9.AF.55HydroxylclinohumiteMg9(SiO4)4(OH)2
9.AF.60LeucophoeniciteMn72+(SiO4)3(OH)2
9.AF.65Ribbeite(Mn2+,Mg)5(SiO4)2(OH)2
9.AF.75FranciscaniteMn62+(V5+,☐)2(SiO4)2(O,OH)6
9.AF.75ÖrebroiteMn32+(Sb5+,Fe3+)(SiO4)(O,OH)3
9.AF.75WeliniteMn62+(W6+,Mg)2(SiO4)2(O,OH)6
9.AF.80EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10
9.AF.85Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2
9.AF.85MagnesiochloritoidMgAl2(SiO4)O(OH)2
9.AF.85Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2
9.AF.90PoldervaartiteCaCa[SiO3(OH)](OH)
9.AF.90OlmiiteCaMn2+[SiO3(OH)](OH)
14.17.1RhodoniteMnSiO3
14.17.2TephroiteMn22+SiO4
14.17.3BrauniteMn2+Mn63+(SiO4)O8
14.17.4AlleghanyiteMn52+(SiO4)2(OH)2
14.17.5Ribbeite(Mn2+,Mg)5(SiO4)2(OH)2
14.17.6LeucophoeniciteMn72+(SiO4)3(OH)2
14.17.8BementiteMn7Si6O15(OH)8
14.17.9Parsettensite(K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2O
14.17.10YofortieriteMn5Si8O20(OH)2 · 8-9H2O

Other Names for Jerrygibbsite

Name in Other Languages:

Other Information

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 Jerrygibbsite

Reference List:
American Mineralogist (1984): 69: 546-552.

Neues Jahrbuch für Mineralogie, Monatshefte (1989): 9, 410-430. (structure)

Internet Links for Jerrygibbsite

Localities for Jerrygibbsite

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.
Namibia
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
Donald R. Peacor, Pete J. Dunn, Shu-Chun Su and John Innes(1987): Ribbeite, a polymorph of alleghanyite and member of the leucophoenicite group from the Kombat mine, Namibia. American Mineralogist, Volume 72, pages 213-216
Romania
 
  • Maramureș Co.
http://minerals-of-the-carpathians.eu; Udubasa, G., Hartopanu, P., Ilinca, G. (1996). The Regionally metamorphosed Fe-Mn Ore Deposit at Razoare, Preluca Mts., Romania. Romanian Journal of Mineralogy, 77, 3-20.
USA (TL)
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Dunn, P.J., et al: Am.Min.:69:546-552 (1984); Dunn, P.J.: Am.Min.:70:379-387 (1985); Dunn(1995):Pt3:356.
Mineral and/or Locality  
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