A small prospect pit near the long abandoned Clear Creek mercury mines, New Idria district, San Benito County, California, USA. Link to MinDat.org Location Data.
Name Origin:
For Dr. Peter Bayliss, Prof. emeritus of Mineralogy, Department of Geology and Geophysics, University of Calgary, Alberta, Canada.
Name Pronunciation:
Peterbaylissite + Pronunciation
Synonym:
IMA1993-041
Peterbaylissite Crystallography
Axial Ratios:
a:b:c =0.9991:1:0.9628
Cell Dimensions:
a = 11.13, b = 11.139, c = 10.725, Z = 8; V = 1,329.65 Den(Calc)= 7.14
Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
4-5 - Fluorite-Apatite
Luster:
Sub Metallic
Streak:
dark brownish black
Optical Properties of Peterbaylissite
Gladstone-Dale:
CI meas= 0.04 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1541,KPDmeas= 0.1541,KC= 0.1605 Ncalc = 2.15
Optical Data:
Biaxial (?), a=2.1
RL Anisotrophism:
Weak, dark gray to brown.
RL Bireflectance:
Weak to moderate.
RL Color:
Gray with slight bluish tinge.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Peterbaylissite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
12.00
13.20
420 nm
11.80
12.80
440 nm
11.60
12.60
460 nm
11.50
12.30
480 nm
11.30
12.10
500 nm
11.20
11.90
520 nm
11.10
11.70
540 nm
11.00
11.60
560 nm
10.90
11.50
580 nm
10.90
11.50
600 nm
10.80
11.40
620 nm
10.70
11.30
640 nm
10.80
11.20
660 nm
10.60
11.20
680 nm
10.60
11.20
700 nm
10.60
11.20
Calculated Relative Intensity Colors of Peterbaylissite in Air
Relative Intensity
0%
90%
100%
180%
270%
360%
450%
540%
630%
720%
810%
R1
R2
Calculated Properties of Peterbaylissite
Electron Density:
Bulk Density (Electron Density)=5.97 gm/cc note: Specific Gravity of Peterbaylissite =7.14 gm/cc.
Fermion Index:
Fermion Index = 0.25 Boson Index = 0.75
Photoelectric:
PEPeterbaylissite =1,424.38 barns/electron U=PEPeterbaylissite x rElectron Density=8,508.07 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Peterbaylissite is Not Radioactive
Chemical Formula: 
