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Jerrygibbsite

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Formula:
Mn
2+
9
(SiO
 
4
)
 
4
(OH)
 
2
System:OrthorhombicColour:Violet pink to pinkish ...
Hardness:
Member of:Humite Group
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.
Isostructural with:Alleghanyite, Chegemite, Chondrodite, Edgrewite, Hydroxylchondrodite, Hydroxylclinohumite, Kumtyubeite, Leucophoenicite, Manganhumite, Norbergite, Reinhardbraunsite, Ribbeite, Sonolite


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

IMA status:Approved 1981
Strunz 8th edition ID:8/B.04-100
Nickel-Strunz 10th (pending) edition ID:9.AF.70

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
Dana 8th edition ID: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
Hey's CIM Ref.:14.17.7

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

Type Locality:Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
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:
ZinciteWillemiteTephroiteFranklinite

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

Lustre: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 (measured):4.00 g/cm3
Density (calculated):4.07 g/cm3

Crystallography of Jerrygibbsite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pbcn {P21/b 2/c 21/n}
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:
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
Maximum Birefringence:δ = 0.017

Chart 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:
Mn
2+
9
(SiO
 
4
)
 
4
(OH)
 
2
Simplified for copy/paste:Mn2+9(SiO4)4(OH)2
Essential elements:H, Mn, O, Si
All elements listed in formula:H, Mn, O, Si
Common Impurities:Fe,Zn,Mg,Ca,H2O

Relationship of Jerrygibbsite to other Species

Member of:Humite Group
Other Members of Group:

- +
Alleghanyite
Mn
2+
5
(SiO
 
4
)
 
2
(OH)
 
2
Chegemite
Ca
 
7
(SiO
 
4
)
 
3
(OH)
 
2
Chondrodite
(Mg,Fe
2+
 
)
 
5
(SiO
 
4
)
 
2
(F,OH)
 
2
Clinohumite
Mg
 
9
(SiO
 
4
)
 
4
F
 
2
Edgrewite
Ca
 
9
(SiO
 
4
)
 
4
F
 
2
Humite
(Mg,Fe
2+
 
)
 
7
(SiO
 
4
)
 
3
(F,OH)
 
2
Hydroxylchondrodite
Mg
 
5
(SiO
 
4
)
 
2
(OH)
 
2
Hydroxylclinohumite
Mg
 
9
(SiO
 
4
)
 
4
(OH)
 
2
Kumtyubeite
Ca
 
5
(SiO
 
4
)
 
2
F
 
2
Leucophoenicite
Mn
2+
7
(SiO
 
4
)
 
3
(OH)
 
2
Maclureite (Seybert; Nuttall)
Manganhumite
(Mn
2+
 
,Mg)
 
7
(SiO
 
4
)
 
3
(OH)
 
2
Norbergite
Mg
 
3
(SiO
 
4
)(F,OH)
 
2
Reinhardbraunsite
Ca
 
5
(SiO
 
4
)
 
2
(OH,F)
 
2
Ribbeite
(Mn
2+
 
,Mg)
 
5
(SiO
 
4
)
 
2
(OH)
 
2
Sonolite
Mn
2+
9
(SiO
 
4
)
 
4
(OH,F)
 
2
Unnamed (Ca-analogue of Humite)
Ca
 
7
(SiO
 
4
)
 
4
F
 
2
Unnamed (F-analogue of Chegemite)
Ca
 
7
(SiO
 
4
)
 
3
(F,OH)
 
2
Common Associates:
SonoliteLeucophoenicite
Related Minerals - Nickel-Strunz Grouping):

- +
9.AF.05Sillimanite
Al
 
2
(SiO
 
4
)O
9.AF.10Andalusite
Al
 
2
(SiO
 
4
)O
9.AF.10Kanonaite
Mn
3+
 
Al(SiO
 
4
)O
9.AF.15Kyanite
Al
 
2
(SiO
 
4
)O
9.AF.20Mullite
Al
 
4+2x
Si
 
2-2x
O
 
10-x
9.AF.20Krieselite
(Al,Ga)
 
2
(GeO
 
4
)(OH)
 
2
9.AF.23Boromullite
Al
 
9
BSi
 
2
O
 
19
9.AF.25Yoderite
Mg(Al,Fe
3+
 
)
 
3
(SiO
 
4
)
 
2
O(OH)
9.AF.30Magnesiostaurolite
(Mg,Li,Fe
2+
 
)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH)
 
2
9.AF.30Staurolite
(Fe
2+
 
,Mg,Zn)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH,O)
 
2
9.AF.30Zincostaurolite
(Zn,Li,Fe
2+
 
,Mg)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH)
 
2
9.AF.35Topaz
Al
 
2
(SiO
 
4
)(F,OH)
 
2
9.AF.40Norbergite
Mg
 
3
(SiO
 
4
)(F,OH)
 
2
9.AF.45Alleghanyite
Mn
2+
5
(SiO
 
4
)
 
2
(OH)
 
2
9.AF.45Chondrodite
(Mg,Fe
2+
 
)
 
5
(SiO
 
4
)
 
2
(F,OH)
 
2
9.AF.45Reinhardbraunsite
Ca
 
5
(SiO
 
4
)
 
2
(OH,F)
 
2
9.AF.45Kumtyubeite
Ca
 
5
(SiO
 
4
)
 
2
F
 
2
9.AF.45Hydroxylchondrodite
Mg
 
5
(SiO
 
4
)
 
2
(OH)
 
2
9.AF.50Humite
(Mg,Fe
2+
 
)
 
7
(SiO
 
4
)
 
3
(F,OH)
 
2
9.AF.50Manganhumite
(Mn
2+
 
,Mg)
 
7
(SiO
 
4
)
 
3
(OH)
 
2
9.AF.50Unnamed (Ca-analogue of Humite)
Ca
 
7
(SiO
 
4
)
 
4
F
 
2
9.AF.55Clinohumite
Mg
 
9
(SiO
 
4
)
 
4
F
 
2
9.AF.55Sonolite
Mn
2+
9
(SiO
 
4
)
 
4
(OH,F)
 
2
9.AF.55Hydroxylclinohumite
Mg
 
9
(SiO
 
4
)
 
4
(OH)
 
2
9.AF.60Leucophoenicite
Mn
2+
7
(SiO
 
4
)
 
3
(OH)
 
2
9.AF.65Ribbeite
(Mn
2+
 
,Mg)
 
5
(SiO
 
4
)
 
2
(OH)
 
2
9.AF.75Franciscanite
Mn
2+
6
(V
5+
 
,☐)
 
2
(SiO
 
4
)
 
2
(O,OH)
 
6
9.AF.75Örebroite
Mn
2+
3
(Sb
5+
 
,Fe
3+
 
)(SiO
 
4
)(O,OH)
 
3
9.AF.75Welinite
Mn
2+
6
(W
6+
 
,Mg)
 
2
(SiO
 
4
)
 
2
(O,OH)
 
6
9.AF.80Ellenbergerite
Mg
 
6
(Mg,Ti,Zr,◻)
 
2
(Al,Mg)
 
6
Si
 
8
O
 
28
(OH)
 
10
9.AF.85Chloritoid
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
(SiO
 
4
)O(OH)
 
2
9.AF.85Magnesiochloritoid
MgAl
 
2
(SiO
 
4
)O(OH)
 
2
9.AF.85Ottrélite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
(SiO
 
4
)O(OH)
 
2
9.AF.90Poldervaartite
CaCa[SiO
 
3
(OH)](OH)
9.AF.90Olmiite
CaMn
2+
 
[SiO
 
3
(OH)](OH)
Related Minerals - Hey's Index Grouping:

- +
14.17.1Rhodonite
MnSiO
 
3
14.17.2Tephroite
Mn
2+
2
SiO
 
4
14.17.3Braunite
Mn
2+
 
Mn
3+
6
(SiO
 
4
)O
 
8
14.17.4Alleghanyite
Mn
2+
5
(SiO
 
4
)
 
2
(OH)
 
2
14.17.5Ribbeite
(Mn
2+
 
,Mg)
 
5
(SiO
 
4
)
 
2
(OH)
 
2
14.17.6Leucophoenicite
Mn
2+
7
(SiO
 
4
)
 
3
(OH)
 
2
14.17.8Bementite
Mn
 
7
Si
 
6
O
 
15
(OH)
 
8
14.17.9Parsettensite
K
 
1.2
Mn
 
8
(Si,Al)
 
12
O
 
26
(OH)
 
10
14.17.10Yofortierite
Mn
 
5
Si
 
8
O
 
20
(OH)
 
2
· 8-9H
 
2
O

Other Names for Jerrygibbsite

Synonyms:
IMA1981-059
Other Languages:
German:Jerrygibbsit
Russian:Джерриджиббсит
Spanish:Jerrygibbsita

Other Information

Fluorescence in UV light:Not fluorescent.
Health Warning: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)

Best Localities for Jerrygibbsite

Best of Species:Jerrygibbsite

Internet Links for Jerrygibbsite

Search Engines:
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  • External Links:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Jerrygibbsite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Jerrygibbsite

    The 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. ? 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
    USA
     
    • 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.
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