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Whewellite (calcium oxalate monohydrate) heat decomposition mass curve. The whewellite decomposes first to anhydrous calcium oxalate, then to calcium carbonate (losing carbon monoxide), and finally to calcium oxide (losing carbon
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Whewellite, or at least crystalline calcium oxalate, does also arise from biological sources. Small crystals or flakes of it are sometimes found on the surfaces of some
605:
Dana's System of
Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)"
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352:. Because of its organic content it is thought to have an indirect biological origin; this hypothesis is supported by its presence in
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deposits where a biological source appears improbable. For this reason, it may be classed as a true mineral.
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548:"The crystal structures of whewellite and weddellite: re-examination and comparison"
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List of minerals recognized by the
International Mineralogical Association
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standard due to its well-known decomposition temperatures and products.
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01} good, {010} imperfect, {001} indistinct, {110} indistinct
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and inventor of the system of crystallographic indexing.
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John Wiley and Sons, Inc., New York, pp. 1099–1101.
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33:A white Whewellite crystal from Schlema, Germany
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603:Palache, P.; Berman H.; Frondel, C. (1960). "
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267:Biaxial (+), colorless (transmitted light)
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546:Tazzoli, V.; Domeneghetti, M.C. (1980).
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378:frequently have the same composition.
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363:. However, it has also been found in
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461:"IMA–CNMNC approved mineral symbols"
277:Insoluble in water, soluble in acids
440:List of minerals named after people
400:, professor of moral philosophy at
636:. You can help Knowledge (XXG) by
165:Equant or stout prismatic crystals
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624:This article about a specific
155:Colorless, yellowish, brownish
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580:. Merriam-Webster Dictionary
381:Whewellite was named after
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703:Minerals described in 1840
698:Minerals in space group 14
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423:thermogravimetric analysis
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421:Whewellite is used as a
324:is a mineral, hydrated
534:Handbook of Mineralogy
511:Whewellite: mindat.org
465:Mineralogical Magazine
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552:American Mineralogist
415:
91:Strunz classification
693:Monoclinic minerals
486:10.1180/mgm.2021.43
477:2021MinM...85..291W
459:Warr, L.N. (2021).
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408:Heat decomposition
264:Optical properties
239:Vitreous to pearly
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688:Oxalate minerals
683:Calcium minerals
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385:(1794–1866), an
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255:Specific gravity
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117:Prismatic (2/m)
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59:(repeating unit)
48:Oxalate minerals
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522:Webmineral.com
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471:(3): 291–320.
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147:Identification
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638:expanding it
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597:Bibliography
582:. Retrieved
578:"whewellite"
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560:. Retrieved
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365:hydrothermal
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562:31 December
358:sedimentary
249:Transparent
245:Diaphaneity
131:Space group
677:Categories
630:mineraloid
446:References
394:naturalist
328:, formula
291:Whewellite
282:References
273:Solubility
222:Mohs scale
206:Conchoidal
122:H-M symbol
106:Monoclinic
81:IMA symbol
22:Whewellite
558:: 327–334
495:235729616
417:dioxide).
402:Cambridge
398:scientist
429:See also
390:polymath
225:hardness
212:Tenacity
202:Fracture
188:Cleavage
171:Twinning
142:(no. 14)
95:10.AB.45
44:Category
626:mineral
473:Bibcode
387:English
361:nodules
216:Brittle
55:Formula
39:General
16:Mineral
584:30 May
493:
374:, and
235:Luster
120:(same
632:is a
491:S2CID
372:cacti
229:2.5–3
152:Color
634:stub
586:2024
564:2020
396:and
356:and
354:coal
259:2.23
628:or
481:doi
305:juː
85:Whe
63:CaC
679::
556:65
554:.
550:.
503:^
489:.
479:.
469:85
467:.
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392:,
330:Ca
314:aɪ
140:/c
136:P2
71:·H
665:e
658:t
651:v
640:.
588:.
566:.
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348:2
346:H
344:·
342:4
339:O
336:2
333:C
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317:t
311:l
308:ə
302:h
299:ˈ
296:/
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