Pyrophyllite

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Phyllosilicate

Sample ID

SU1421

Collection Locality

unknown

Spectral Purity

1b2_3_4_ # SU1421 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

None # XRF, EPMA, ICP(Trace), WChem COMPOSITION_TRACE:

Sample Description

IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA, 6.5-9.5 keV File: pyrp1421.mdi (smear on quartz plate) References: Huebner's reference patterns; PDF #12-203, 16-0344, 12-0203 Sought: Talc, Montmorillonite, Kaolinite, Chlorite, Paragonite, Phlogopite Found: Pyrophyllite, mica, minor quartz. Comment: Pattern dominated by very strong basal pyrophyllite peaks having excellent alpha1-alpha2 resolution at high 2 theta resolution. Non-basal pyrophyllite reflections are weak. The pyrophyllite 2M1 (PDF2 #12-0203) is a much better match than triclinic pyrophyllite (25-0022). Unit cell refinement using nine lattice spacing's, using the positions of the quartz peaks as an internal standard, yields a=5.161(4), b=8.934(14), c=18.650(6) Angstroms and beta=99.68(5) degrees. Unindexed peaks at 7.63 (moderate), 7.16, 3.80, 3.58, and 3.24 Angstroms (all weak) indicate the presence of a fourth phase.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126