| 单词 |
mineraloid |
| 释义 |
mineraloid Min.|ˈmɪnərəlɔɪd|
[a. G. mineraloid (J. Niedźwiedzki 1909, in Centralbl. f. Min., Geol. u. Paläont. 662), f. mineral mineral n.: see -oid.]
A substance that might be regarded as a mineral but is amorphous rather than crystalline.
1913A. F. Rogers in Proc. Amer. Philos. Soc. LII. 608 The question of names for colloidal or amorphous minerals arises... Niedzwiedzki has proposed the term mineraloid for the natural amorphous substances. 1917― in Jrnl. Geol. XXV. 526 Lechateliérite is a glass and may be considered along with other natural glasses as a mineraloid. Ibid. 540 The hydrocarbons may be included under Niedzwiedski's term mineraloid. As Niedzwiedski used this term for all naturally occurring amorphous substances, this changes somewhat the original definition of mineraloid. Such substances as opal, cliachite, limonite, collophane, halloysite, etc., are definite enough to be called minerals even though they are amorphous. The term ‘mineraloid’ seems appropriate for the less definite mineral-like substances. 1941C. S. Hurlbut Dana's Man. Min. (ed. 15) iii. 94 There are a number of mineral substances whose analyses do not yield definite chemical formulas and further show no signs of crystallinity. They have been called gel minerals or mineraloids. 1944A. Holmes Princ. Physical Geol. iv. 37 Only a few noncrystalline substances are regarded, by common usage, as minerals, and these are generally distinguished as mineraloids. 1951[see jordisite]. 1972G. S. Fay Rockhound's Manual iii. 37 Mineraloids are substances which look like and are often grouped with minerals, but mineraloids have an amorphous, or noncrystalline, structure as is evident when viewed under high-power microscopes. Opal is a mineraloid. |
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