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Bobmeyerite

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About BobmeyeriteHide

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 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.



Classification of BobmeyeriteHide

Approved
Approval Year:
2012

Pronounciation of BobmeyeriteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya 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.

Chemical Properties of BobmeyeriteHide

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

X-Ray Powder DiffractionHide

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

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:
Cerussite8 photos of Bobmeyerite associated with Cerussite on mindat.org.
Quartz4 photos of Bobmeyerite associated with Quartz on mindat.org.
Caledonite3 photos of Bobmeyerite associated with Caledonite on mindat.org.
Diaboleite2 photos of Bobmeyerite associated with Diaboleite on mindat.org.
Georgerobinsonite1 photo of Bobmeyerite associated with Georgerobinsonite on mindat.org.
Leadhillite1 photo of Bobmeyerite associated with Leadhillite on mindat.org.

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.

References for BobmeyeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Pluth, J.J., Chen, Y.-S., Roberts, A.C. and Housley, R.M. (2012): Bobmeyerite, IMA 2012-019. CNMNC Newsletter No. 14, October 2012, page 1282; Mineralogical Magazine, 76, 1281-1288.
Kampf, 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(1): 81-91.

Internet Links for BobmeyeriteHide

Localities for BobmeyeriteHide

ⓘ - 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.
USA (TL)
 
  • Arizona
    • Pinal Co.
      • Mammoth District
        • Tiger
          • St. Anthony deposit
Kampf, A.R., Pluth, J.J., Chen, Y.-S., Roberts, A.C. and Housley, R.M. (2012): Bobmeyerite, IMA 2012-019. CNMNC Newsletter No. 14, October 2012, page 1282; Mineralogical Magazine, 76, 1281-1288.
Mineral and/or Locality  
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