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Bobmeyerite

A valid IMA mineral species
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About BobmeyeriteHide

02933850017055199484160.jpg
Bob Meyer
Formula:
Pb4(Al3Cu)(Si4O12)(S0.5Si0.5O4)(OH)7Cl(H2O)3
The above formula is from the original description; the formula from the IMA proposal: Pb4Al4(Si4O12)(OH)11Cl(H2O)
Colour:
colorless to white
Lustre:
Vitreous
Specific Gravity:
4.381 (Calculated)
Crystal System:
Orthorhombic
Name:
Honours Robert (Bob) Owen Meyer (b. 1956) of Maple Valley, Washington, USA. Mr Meyer acquired his first specimen from the Mammoth-Saint Anthony mine in 1978 and has subsequently spent thousands of hours studying specimens from the deposit.
Closely (structurally) related to cerchiaraite group and ashburtonite. Contains some Cr3+. Unique combination of elements.

In the structure there are (1) corner sharing SiO4 tetrahedra, forming Si4O12 rings centered on the c axis and alternating along [001] with Cl atoms; (2) chains of edge-sharing AlO6 octahedra, parallel to [001], that provide a link for the rings; (3) large channels || [001]; (4) two non-equivalent PbO10Cl polyhedra, with 8 framework and 2 channel oxygens, and off-centered Pb atoms; (5) channel-hosted water molecules loosely bond to Pb; (6) excess S, Cr3+, and Si (0.58, 0.40 and 0.13 apfu, respectively), presumably tetrahedrally coordinated within channels.



Unique IdentifiersHide

Mindat ID:
43334
Long-form identifier:
mindat:1:1:43334:7
GUID
(UUID V4):
d74dc696-0dd6-4614-b2aa-778540dd6b23

IMA Classification of BobmeyeriteHide

Approved
IMA Formula:
Pb4(Al3Cu)(Si4O12)(S0.5Si0.5O4)(OH)7Cl(H2O)3
Approval year:
2012

Classification of BobmeyeriteHide

9.CF.

9 : SILICATES (Germanates)
C : Cyclosilicates
F : [Si4O12]8- 4-membered single rings, with insular complex anions

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
BmyIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Pronunciation of BobmeyeriteHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of BobmeyeriteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
colorless to white
Streak:
white
Comment:
could not be measured
Tenacity:
Brittle
Cleavage:
None Observed
Comment:
frature could not be determined
Density:
4.381 g/cm3 (Calculated)

Optical Data of BobmeyeriteHide

Type:
Biaxial (-)
RI values:
nα = 1.756(4) nβ = 1.759(2) nγ = 1.759(2)
2V:
Measured: not determined° , Calculated: not determined°
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Non-pleochroic
Comments:
The small size of the fibres precluded conoscopic observation, and therefore the 2V could not be determined, but it is expected to be very small.

Chemistry of BobmeyeriteHide

Mindat Formula:
Pb4(Al3Cu)(Si4O12)(S0.5Si0.5O4)(OH)7Cl(H2O)3

The above formula is from the original description; the formula from the IMA proposal: Pb4Al4(Si4O12)(OH)11Cl(H2O)
Common Impurities:
F,Cr,(Ca)

Crystallography of BobmeyeriteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnnm
Setting:
Pnnm
Cell Parameters:
a = 13.969(9) Å, b = 14.243(10) Å, c = 5.893(4) Å
Ratio:
a:b:c = 0.981 : 1 : 0.414
Unit Cell V:
1173.6 ų
Z:
2

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0019796BobmeyeriteKampf A R, Pluth J J, Chen Y S, Roberts A C, Housley R M (2013) Bobmeyerite, a new mineral from Tiger, Arizona, USA, structurally related to cerchiaraite and ashburtonite Mineralogical Magazine 77 81-912013Tiger mine, Arizona, USA0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.051 Å(35)
5.474 Å(54)
5.011 Å(35)
4.333 Å(43)
3.278 Å(77)
2.966 Å(88)
2.549 Å(100)
1.873 Å(39)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)

Type Occurrence of BobmeyeriteHide

General Appearance of Type Material:
needles which are elongated on [001] and taper to sharp points
Place of Conservation of Type Material:
Mineral Sciences Department, Natural
History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers 63824, 63825 and 63826
Geological Setting of Type Material:
baryte, fluorite and ores of gold, lead, molybdenum, silver, tungsten, vanadium and zinc deposit with oxidation attributed to progressive alteration and crystallization in a closed system.
Associated Minerals at Type Locality:

Synonyms of BobmeyeriteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
8 photos of Bobmeyerite associated with CerussitePbCO3
6 photos of Bobmeyerite associated with QuartzSiO2
5 photos of Bobmeyerite associated with CaledonitePb5Cu2(SO4)3(CO3)(OH)6
4 photos of Bobmeyerite associated with GeorgerobinsonitePb4(CrO4)2(OH)2FCl
3 photos of Bobmeyerite associated with DiaboleitePb2CuCl2(OH)4
1 photo of Bobmeyerite associated with LeadhillitePb4(CO3)2(SO4)(OH)2

Related Minerals - Strunz-mindat GroupingHide

9.CF.05AshburtonitePb4Cu4(Si4O12)(HCO3)4(OH)3Cl · H2OTet.
9.CF.10Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2OOrth. mmm (2/m 2/m 2/m)
9.CF.15ClinophosinaiteNa12(Ca,Sr)4(Si4O12)(PO4)4Mon. 2/m : P2/b
9.CF.15Phosinaite-(Ce)Na13Ca2(Ce,La,Th,Nd,Pr)(Si4O12)(PO4)4Orth. 2 2 2 : P21 21 2
9.CF.20StrakhoviteNaBa3Mn2+2Mn3+2Si6O19(OH)3Orth. mmm (2/m 2/m 2/m)
9.CF.25Cerchiaraite-(Mn)Ba4Mn3+4(Si4O12)O2(OH)4Cl2[Si2O3(OH)4]Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
9.CF.25Cerchiaraite-(Al)Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
9.CF.25Cerchiaraite-(Fe)Ba4Fe3+4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm

Other InformationHide

IR Spectrum:
OH & H2O: 3386 cm-1 (stretching), 1649 cm-1 (bending)
Notes:
Bobmeyerite dissolves very slowly in concentrated HCl; it is insoluble and unreactive in concentrated H2SO4 and 70% HNO3.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for BobmeyeriteHide

References for BobmeyeriteHide

Localities for BobmeyeriteHide

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Arizona
    • Pinal County
      • Mammoth Mining District
        • Tiger
          • St. Anthony deposit
Williams et al. (2012) +2 other references
 
Mineral and/or Locality  
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