Difference between revisions of "Dawsonite"
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| − | '''Dawsonite''' is a mineral composed of [[sodium]] [[aluminium]] [[carbonate]] [[hydroxide]], chemical formula NaAlCO<sub>3</sub>(OH)<sub>2</sub>. It was discovered in 1874 during the construction of the [[Redpath Museum]] in a [[Feldspar|feldspathic]] [[dike (geology)|dike]] on the campus of [[McGill University]] on the Island of Montreal, Canada. | + | {{Infobox mineral |
| + | | name = Dawsonite | ||
| + | | category = [[Carbonate mineral]]s | ||
| + | | boxwidth = | ||
| + | | boxbgcolor = | ||
| + | | image = | ||
| + | | imagesize = | ||
| + | | caption = | ||
| + | | formula = NaAlCO<sub>3</sub>(OH)<sub>2</sub> | ||
| + | | strunz = 05.BB.10 | ||
| + | | dana = 16a.03.08.01 | ||
| + | | symmetry = 2/m 2/m 2/m | ||
| + | | molweight = 144.00 | ||
| + | | color = white | ||
| + | | habit = encrustations or radial | ||
| + | | system = [[Orthorhombic crystal system|orthorhombic]] | ||
| + | | twinning = | ||
| + | | cleavage = perfect on {110} | ||
| + | | fracture = uneven | ||
| + | | mohs = 3 | ||
| + | | luster = vitreous | ||
| + | | refractive = ''n<sub>α</sub> = 1.466<br/>''n''<sub>β</sub> = 1.542<br/>''n''<sub>γ</sub> = 1.596 | ||
| + | | opticalprop = | ||
| + | | birefringence = ''δ'' = 0.130 | ||
| + | | 2V = 77º | ||
| + | | pleochroism = | ||
| + | | streak = white | ||
| + | | gravity = 2.436 | ||
| + | | density = | ||
| + | | melt = | ||
| + | | fusibility = | ||
| + | | diagnostic = | ||
| + | | solubility = | ||
| + | | diaphaneity = transparent | ||
| + | | other = | ||
| + | | references = <ref name="MinDat">{{MinDat-ref | name = Dawsonite | id = 1240 | accessdate = 2009-12-06}}.</ref><ref name="Webmineral">{{WebMineral-ref | name = Dawsonite | url = http://webmineral.com/data/Dawsonite.shtml | accessdate = 2009-12-06}}.</ref> | ||
| + | }} | ||
| + | '''Dawsonite''' is a mineral composed of [[sodium]] [[aluminium]] [[carbonate]] [[hydroxide]], chemical formula NaAlCO<sub>3</sub>(OH)<sub>2</sub>. It was discovered in 1874 during the construction of the [[Redpath Museum]] in a [[Feldspar|feldspathic]] [[dike (geology)|dike]] on the campus of [[McGill University]] on the Island of Montreal, Canada ({{coord|45|30|N|73|40|W| alt=45° 30′ N, 73° 40′ W}}).<ref name="MinDat"/> It is named after Canadian geologist Sir John William Dawson (1820–99).<ref name="Webmineral"/> | ||
| − | The type material is preserved in the collection of the Redpath Museum. | + | The type material is preserved in the collection of the Redpath Museum.<ref name="MinDat"/> |
==See also== | ==See also== | ||
| − | *[[Dihydroxialumini sodium carbonate]], the commercial form, used as an antacid | + | *[[Dihydroxialumini sodium carbonate]], the commercial (artificial) form, used as an antacid |
| − | |||
| − | |||
| − | |||
| − | |||
| + | ==References== | ||
| + | {{reflist}} | ||
[[Category:Sodium minerals]] | [[Category:Sodium minerals]] | ||
Latest revision as of 18:32, 6 December 2009
| Dawsonite | |
|---|---|
| General | |
| Category | Carbonate minerals |
| Chemical formula | NaAlCO3(OH)2 |
| Strunz classification | 05.BB.10 |
| Dana classification | 16a.03.08.01 |
| Crystal symmetry | 2/m 2/m 2/m |
| Identification | |
| Molar mass | 144.00 |
| Color | white |
| Crystal habit | encrustations or radial |
| Crystal system | orthorhombic |
| Cleavage | perfect on {110} |
| Fracture | uneven |
| Mohs scale hardness | 3 |
| Luster | vitreous |
| Streak | white |
| Diaphaneity | transparent |
| Specific gravity | 2.436 |
| Refractive index | nα = 1.466 nβ = 1.542 nγ = 1.596 |
| Birefringence | δ = 0.130 |
| 2V angle | 77º |
| References | [1][2] |
Dawsonite is a mineral composed of sodium aluminium carbonate hydroxide, chemical formula NaAlCO3(OH)2. It was discovered in 1874 during the construction of the Redpath Museum in a feldspathic dike on the campus of McGill University on the Island of Montreal, Canada (45° 30′ N, 73° 40′ W).[1] It is named after Canadian geologist Sir John William Dawson (1820–99).[2]
The type material is preserved in the collection of the Redpath Museum.[1]
See also
- Dihydroxialumini sodium carbonate, the commercial (artificial) form, used as an antacid
References
- ↑ 1.0 1.1 1.2 Dawsonite, <http://www.mindat.org/show.php?id=1240> (accessed 6 December 2009), MinDat.org.
- ↑ 2.0 2.1 Dawsonite, <http://webmineral.com/data/Dawsonite.shtml> (accessed 6 December 2009), WebMineral.com.
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