The Roadmap includes a glossary to attempt to clarify for the reader the ambiguities in meanings and concepts. However, the glossary presently contains many words that are not scientifically or technically valid, as well as definitions of scientific terms that are incorrect or need greater detail.1 The committee emphasizes the need to establish and maintain scientific rigor in the glossary definitions and use of terminology in the Roadmap. The committee strongly endorses the use of correct mineralogical terminology and believes that using accepted and scientifically rigorous terminology and nomenclature throughout the Roadmap, including the Roadmap glossary and in subsequent research activities, is the best means to ensure an accurate understanding of proposed research directions and, ultimately, research outcomes. A complementary goal is that this rigor in terminology may eventually be applied consistently in the regulatory setting. In creating a new acceptable paradigm for risk assessment in this area, the Roadmap should not continue the historical use of ambiguous terminology occasionally found in some existing standards and guidelines. To ensure proper scientific terms, a modern technical glossary or other standard reference text, appropriate for the field of study, should be used and cited. For example, the American Geological Institute Glossary of Geology may be appropriate for many of the mineralogical or geological terms (Neuendorf et al., 2005). Other reference texts should be consulted for words not found in the AGI glossary or for toxicological or epidemiological terms. Words or terms that are not scientifically or technically valid should be removed from the glossary and the text.

NIOSH has also recognized a problem with or deficiency in existing terminology that has caused confusion and concern for researchers, policy makers, and others involved in these issues. NIOSH has introduced the term elongated mineral particle to encompass the broad range of mineral particles that are the primary focus of the proposed research. The committee urges the use of the descriptive term elongate, rather than elongated so as to describe the physical appearance of the particles as opposed to implying that they have been actively lengthened (see also


Suggestions for terms that need well-referenced definitions include acicular, actinolite, amphibole, anthophyllite, asbestiform, asbestos, chrysotile, cleavage fragment, crocidolite, fiber, fibril, fibrous, solid solution series, and tremolite. Note that the terms asbestiform and asbestos are not equivalent to fibrous or fiber; nonasbestiform minerals and synthetic materials can also be fibrous. Suggestions for terms to consider removing from the glossary include countable particle, covered mineral, and fragility. Terms to consider adding to the glossary include crystal and petrographic thin section.

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