ASTM D2799-05a

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D 2799–05a
Standard Test Method for
Microscopical Determination of the Maceral Composition of
1
Coal
This standard is issued under the fixed designation D 2799; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
Maceral Group Maceral
Vitrinite —
1.1 This test method covers the equipment and techniques
Liptinite or (exinite) alginite
usedfordeterminingthephysicalcompositionofacoalsample
cutinite
resinite
in terms of volume percent of the organic components and of
sporinite
mineral matter, if desired.
Inertinite fusinite
1.2 The term weight is temporarily used in this test method
inertodetrinite
macrinite
because of established trade usage. The word is used to mean
micrinite
bothforceandmassandcaremustbetakentodeterminewhich
funginite
is meant in each case (the SI unit for force is newton and for secretinite
semifusinite
mass, kilogram).
1.3 This standard does not purport to address all of the
3.3 Definitions of Terms Specific to This Standard:
safety concerns, if any, associated with its use. It is the
3.3.1 alginite, n—aliptinitemaceralthatisgenerallyspheri-
responsibility of the user of this standard to establish appro-
cal or ovoid, frequently having a crenulated border and
priate safety and health practices and determine the applica-
somewhat irregular reflectance and sometimes occurring in
bility of regulatory limitations prior to use.
clusters reflecting an origin from Botryococcus algae.
3.3.1.1 Discussion—Alginite often occurs as degraded frag-
2. Referenced Documents
ments derived from colonial or unicellular bodies.
2
2.1 ASTM Standards:
3.3.2 cutinite, n—a liptinite maceral in the form of a sheet
D 121 Terminology of Coal and Coke
reflecting its origin from leaf- or twig-covering plant cuticle,
D 2797 Practice for Preparing Coal Samples for Micro-
frequently exhibiting reticulation in planar section and a
scopic Analysis by Reflected Light
serrated edge in cross section.
D 2798 Test Method for Microscopical Determination of
3.3.3 exinite, n—Deprecated term. Use preferred term lip-
the Vitrinite Reflectance of Coal
tinite; sometimes has also been used as a synonym for
D 3174 TestMethodforAshintheAnalysisSampleofCoal
sporinite.
and Coke from Coal
3.3.4 funginite, n—an inertinite maceral occurring as round
D 3177 TestMethodforTotalSulfurintheAnalysisSample
or ovoid bodies, frequently containing voids, reflecting an
of Coal and Coke
origin from fungal sclerotia; also occurs (especially in lower
rank coals) as interlaced, stringy materials derived from fungal
3. Terminology
hyphae.
3.1 Definitions—For definitions of terms, refer to Terminol-
3.3.5 fusinite, n—an inertinite maceral distinguished princi-
ogy D 121.
pally by the preservation of some feature(s) of the plant cell
3.2 Classification—The classification of the microscopic
wall structure, and with a particle size greater than 50 µm
constituents into groups of similar properties in a given coal is
except when it occurs as a fragment within the binder matrix;
as follows:
see also semifusinite.
3.3.6 inertinite, n—macerals that exhibit higher reflectance
1
than other organic substances in the coal.
This test method is under the jurisdiction of ASTM Committee D05 on Coal
and Coke and is the direct responsibility of Subcommittee D05.28 on Petrographic
3.3.6.1 Discussion—In any coal ranked lower than anthra-
Analysis of Coal and Coke.
citic, inertinite reflectance commonly spans the range from
Current edition approved Sept. 15, 2005. Published October 2005. Originally
only slightly higher than associated vitrinite to very high
approved in 1969. Last previous edition approved in 2005 as D 2799 – 05.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
reflectance (often as high as Ro$ 6 %). In anthracitic rank
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
coals, inertinite reflectance may be lower than that of vitrinite,
Standards volume information, refer to the standard’s Document Summary page on
and is then recognized by its morphology and form of
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D 2799–05a
anisotropy. Highly reflecting inertinite commonly exhibits differ chemically, physically, and behavioristically in coals of
relief on polished surface. Its name derives from the fact that different ranks. Some properties can be estimated by the
most varieties behave inertly in the thermoplastic deformation measurement of reflectance (Test Method
...