Residues may be dried in an oven, on a hot plate, or on a sand bath. Dry 

 residues are brushed into a pan or funnel for transfer into glass vials, which 

 may be labelled on the cap, cork, or a paper sticker. Permanent storage requires 

 a painted label or glazed surface on the side of the vial, because silverfish enjoy 

 eating the glue from stickers. One-dram vials hold ample residue for study and 

 require very small storage space. Trays, drawers, original vial boxes, or special 

 boxes are suggested methods of storage. 



DESCRIPTION OF RESIDUES The most common insoluble residues are 



chert, chalcedony, disseminated silica, clastic 

 and crystalline quartz, aluminous matter, and replaced fossils. Anhydrite, gyp- 

 sum, feldspar, glauconite, hematite, pyrite, fluorite, and sphalerite are the most 

 common minerals, but other insoluble minerals are found. 



Table 5-1 is a modified arrangement of the original chart published with 

 the paper on standardized terminology (Ireland, 1947). The terminology is 

 based on description rather than genesis of the residues because genesis of many 

 constituents is unknown, vague, or controversial. Many possible types of residues 

 are given a place in the table, although their existence has not been confirmed. 

 Each term is clear-cut and restrictive, and within certain limits a residue frag- 

 ment may be pigeonholed. It should be emphasized that types of residues grade 

 into other types, and, as some specific fragments may not be easily placed, 

 workers may place a fragment under a different but related type in the 

 classification. 



TERMINOLOGY FOR Definitions of special terms as agreed upon 



INSOLUBLE RESIDUES by the Residue Conference of 1946 are given 



below in alphabetic order. 



Abundant dolomolds or oomolds: See "dolomoldic." 



Anhedral: No crystal form developed. 



Beekite: Botryoidal, subspherical, or discoid accretions of opaque silica 

 replacing organic matter, generally white. 



Chalcedonic: Transparent to translucent; smoky; milky; waxy to greasy; 

 may be any color, generally buff or blue-gray; may be finely mottled. 



Chalky: Uneven or rough fracture surface; commonly dull or earthy; soft 

 to hard; may be finely porous; essentially uniform composition; resembles 

 chalk or tripolite. (Formerly referred to as "dead" or "cotton chert." This in- 

 cludes dull, unglazed porcelaneous material which grades into glazed porcelane- 

 ous material of smooth chert.) 



Chert: Cryptocrystalline varieties of quartz, regardless of color; composed 

 mainly of petrographically microscopic fibers of chalcedony and/or quartz 



81 



