Ammonio-Illite-Smect

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Phyllosilicate

Sample ID

GDS87

Collection Locality

Synthetic

Spectral Purity

1b2b3b4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

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

Sample Description

IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA, 6.5-9.5 keV File: amilsm87_mdi (smear on quartz plate) References: Deer, Howie and Zussman (1962); Srodon and Eberl (1984); PDF2 #29-1496 Found: Rectorite and/or illite Sought: illite, mascagnite Comment: The pattern consists of broad peaks, some having shoulders or tails extending toward lower d-spacings. The alpha1-alpha2 reflections are not resolved. Both rectorite (29-1495, a 1:1 regularly interstratified dioctahedral mica and dioctahedral smectite) and 1M illite (29-1496) explain most features of the pattern. Neither has a basal reflection exactly in the observed position, 11.0 Angstroms. Weak but sharp and symmetric reflections at 6.10 and 5.45 Angstroms are not identified; in a subsequent bulk mount, the intensity at 5.45 Angstroms was greatly enhanced and that at 6.10 Angstroms greatly reduced. Glycolation of the bulk mount so reduced all intensities that the pattern was useless.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126