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Jerrygibbsite
A valid IMA mineral species
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About Jerrygibbsite
Gerald V. Gibbs
Formula:
Mn2+9(SiO4)4(OH)2
Colour:
Violet pink to pinkish violet
Lustre:
Sub-Vitreous, Resinous
Hardness:
5½
Specific Gravity:
4.00
Crystal System:
Orthorhombic
Member of:
Name:
Named by Pete J. Dunn, Donald R. Peacor, William B. Simmons, and Eric J. Essene in 1984 in honor of Gerald "Jerry" V. Gibbs (28 June 1928. Hannover, New Hampshire, USA - ) mineralogist and professor at Virginia Polytechnic Institute, Blacksburg, Virginia, USA. He was awarded the Roebling Medal for 1987.
Type Locality:
Dimorph of:
Isostructural with:
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: The powder XRD pattern of jerrygibbsite shares many of the same reflections (d-spacings) with those of other humite-group minerals, but the calculated unit-cell dimensions are based on a super-cell relationship.
Unique Identifiers
Mindat ID:
2092
Long-form identifier:
mindat:1:1:2092:9
IMA Classification of Jerrygibbsite
Approved
Approval year:
1981
First published:
1984
Classification of Jerrygibbsite
9.AF.70
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
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
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
14 : Silicates not Containing Aluminum
17 : Silicates of Mn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Jgb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Jerrygibbsite
Sub-Vitreous, Resinous
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:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Parallel to {001}
Parallel to {001}
Fracture:
Irregular/Uneven
Comment:
Cleavage is not obvious
Density:
4.00 g/cm3 (Measured) 4.07 g/cm3 (Calculated)
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
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r > v moderate
Optical Extinction:
Parallel. abc = XYZ
Pleochroism:
Non-pleochroic
Chemistry of Jerrygibbsite
Mindat Formula:
Mn2+9(SiO4)4(OH)2
Element Weights:
Elements listed:
Common Impurities:
Fe,Zn,Mg,Ca,H2O
Crystallography of Jerrygibbsite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pbcn
Cell Parameters:
a = 28.17 Å, b = 4.85 Å, c = 10.70 Å
Ratio:
a:b:c = 5.808 : 1 : 2.206
Unit Cell V:
1,461.88 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Massive.
Comment:
Setting is P21cn
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Display Options
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2D | Stereo | Red-Blue | Red-Cyan
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View
CIF File Best | x | y | z | a | b | c
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Rotation
Stop | Start
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Labels
Console Off | On | Grey | Yellow
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014840 | Jerrygibbsite | Kato T, Ito Y, Hashimoto N (1989) The crystal structures of sonolite and jerrygibbsite Neues Jahrbuch fur Mineralogie, Monatshefte 1989 410-430 | 1989 | Franklin, New Jersey | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.25 Å | (9) |
| 4.40 Å | (11) |
| 4.25 Å | (9) |
| 3.74 Å | (24) |
| 3.56 Å | (5) |
| 3.48 Å | (29) |
| 3.21 Å | (14) |
| 2.869 Å | (78) |
| 2.813 Å | (9) |
| 2.752 Å | (49) |
| 2.702 Å | (46) |
| 2.661 Å | (34) |
| 2.631 Å | (3) |
| 2.557 Å | (100) |
| 2.416 Å | (16) |
| 2.377 Å | (11) |
| 2.362 Å | (39) |
| 2.342 Å | (28) |
| 2.225 Å | (4) |
| 2.118 Å | (5) |
| 1.806 Å | (100) |
| 1.730 Å | (18) |
| 1.692 Å | (11) |
| 1.661 Å | (9) |
| 1.567 Å | (26) |
| 1.550 Å | (34) |
| 1.458 Å | (18) |
Comments:
American Mineralogist (1984): 69: 546-552.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Geological Setting:
Manganese silicate deposit where it was originally found as an indistinguishable mixture of several humite group species.
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:
Harvard University, Cambridge, Massachusetts, USA, 125030.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, C3209, R18772, 149037.
The Natural History Museum, London, England 1983,236.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, C3209, R18772, 149037.
The Natural History Museum, London, England 1983,236.
Geological Setting of Type Material:
Metamorphosed manganese-bearing zinc silicate and zinc oxide ore deposit.
Associated Minerals at Type Locality:
Synonyms of Jerrygibbsite
Other Language Names for Jerrygibbsite
Relationship of Jerrygibbsite to other Species
Member of:
Other Members of Leucophoenicite Subgroup:
| Leucophoenicite | Mn2+7(SiO4)3(OH)2 | Mon. 2/m : P21/c |
| Ribbeite | Mn2+5(SiO4)2(OH)2 | Orth. mmm(2/m2/m2/m) |
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 9.AF. | Chegemite | Ca7(SiO4)3(OH)2 |
| 9.AF. | Jingwenite-(Y) | YAlV4+(SiO4)O2(OH)2 |
| 9.AF. | Barwoodite | Mn2+6Nb5+(SiO4)2O3(OH)3 |
| 9.AF.05 | Sillimanite | Al2(SiO4)O |
| 9.AF.05 | 'Xenolite' | Al10Si8O31 |
| 9.AF.10 | Kanonaite | Mn3+Al(SiO4)O |
| 9.AF.10 | Andalusite | Al2(SiO4)O |
| 9.AF.15 | Kyanite | Al2(SiO4)O |
| 9.AF.20 | Krieselite | Al2(GeO4)F2 |
| 9.AF.20 | Mullite | Al4+2xSi2-2xO10-x |
| 9.AF.23 | Boromullite | Al9BSi2O19 |
| 9.AF.25 | Yoderite | Mg(Al,Fe3+)3(SiO4)2O(OH) |
| 9.AF.30 | Zincostaurolite | Zn2Al9Si4O23(OH) |
| 9.AF.30 | Staurolite | Fe2+2Al9Si4O23(OH) |
| 9.AF.30 | Magnesiostaurolite | Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4 |
| 9.AF.35 | Topaz | Al2(SiO4)(F,OH)2 |
| 9.AF.40 | Norbergite | Mg3(SiO4)F2 |
| 9.AF.45 | Chondrodite | Mg5(SiO4)2F2 |
| 9.AF.45 | Kumtyubeite | Ca5(SiO4)2F2 |
| 9.AF.45 | Reinhardbraunsite | Ca5(SiO4)2(OH,F)2 |
| 9.AF.45 | Hydroxylchondrodite | Mg5(SiO4)2(OH)2 |
| 9.AF.45 | Alleghanyite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.50 | 'Unnamed (Ca-analogue of Humite)' | Ca7(SiO4)4F2 |
| 9.AF.50 | Humite | Mg7(SiO4)3F2 |
| 9.AF.50 | Manganhumite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.50 | 'Unnamed (OH-analogue of humite)' | Mg7(SiO4)3(OH)2 |
| 9.AF.50 | Fluorchegemite | Ca7(SiO4)3F2 |
| 9.AF.55 | Hydroxylclinohumite | Mg9(SiO4)4(OH)2 |
| 9.AF.55 | Clinohumite | Mg9(SiO4)4F2 |
| 9.AF.55 | Sonolite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.60 | Leucophoenicite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.65 | Ribbeite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.75 | Franciscanite | Mn2+6(V5+,◻)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Scorticoite | Mn6(Sb,◻)Σ2(SiO4)2O3(OH)3 |
| 9.AF.75 | Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Örebroite | Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3 |
| 9.AF.80 | Ellenbergerite | Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10 |
| 9.AF.85 | Magnesiochloritoid | MgAl2O(SiO4)(OH)2 |
| 9.AF.85 | Ottrélite | Mn2+Al2O(SiO4)(OH)2 |
| 9.AF.85 | Chloritoid | Fe2+Al2O(SiO4)(OH)2 |
| 9.AF.90 | Olmiite | CaMn2+[SiO3(OH)](OH) |
| 9.AF.90 | Poldervaartite | CaCa[SiO3(OH)](OH) |
| 9.AF.95 | Pilawite-(Y) | Ca2Y2Al4(SiO4)4O2(OH)2 |
Fluorescence of Jerrygibbsite
Not fluorescent in UV.
Franklin Mine, Franklin, Sussex County, New Jersey, USA