(H 405) and one gives Type III (H 425) shown in Plate 
X XI. The small differences between these two types 
may be due to oxidation and progressive polymerization. 
Both are similar to the Magothy River family. 
Cation Diablo, Arizona Amber 
One spectrum (H 865) of amber was run from USNM 
collection #62998 (Plate XXIV). The age of this sample 
is unknown; in fact, no data are available for it. The 
spectrum is somewhat like those belonging to the Atlan- 
tic Coastal Plain Magothy family of ambers. 
Keuadorian Amber 
Amber from a “‘large deposit’” near Guayaquil, Kcua- 
dor, was reported by Johnston (1888) and named Guaya- 
quillite. No geologic age was given. ‘Two kinds, a light 
yellow, almost homogeneous material and a dark brown, 
bituminous-like substance, were found. The ‘‘pure”’ 
mineral is opaque, powders easily, and is soluble in alco- 
hol. The specific gravity is 1.092 and the melting point 
between 157°-212° C. 
Three spectra were made from USNM collection 
/R7328. Spectrum (H 212) is typical for the three (Plate 
X XV). Frondell (1967) has shown that X-ray diffraction 
patterns of Guayaquillite are similar to those of a sample 
of various species of Protiwm, a genus in the Burseraceae. 
Some infrared spectra of Protiwm Icicariba suggest the 
same relationship, whereas other species of Protiwm 
differ significantly. 
Colombian Amber 
We have examined amber from two localities in Co- 
lombia. Boussingault (1843) reported amber to have been 
found in large amounts in a gold-bearing alluvium at 
Giron, near Bucaramanga, Departamento de Santander 
[98 | 
