Adelite
The rare mineral adelite, is a calcium, magnesium, arsenate with chemical formula CaMgAsO4OH. It forms a solid solution series with the vanadium-bearing mineral gottlobite. Various transition metals substitute for magnesium and lead replaces calcium leading to a variety of similar minerals in the adelite - duftite group.
| Adelite | |
|---|---|
 Pinkish crystal aggregates of adelite from the Franklin deposit in Ogdensburg, New Jersey | |
| General | |
| Category | Adelite-descloizite group |
| Formula (repeating unit) | CaMg(AsO4)(OH) |
| Strunz classification | 8.BH.35 |
| Dana classification | 41.5.1.1 |
| Crystal system | Orthorhombic |
| Crystal class | 2 2 2 - Disphenoidal |
| Space group | P212121 |
| Identification | |
| Color | Colourless, white, grey, bluish grey, yellowish grey, yellow, pale green, pinkish brown, brown |
| Crystal habit | Elongate crystals, massive |
| Cleavage | None Observed |
| Mohs scale hardness | 5 |
| Luster | Vitreous, Greasy |
| Diaphaneity | Transparent, Translucent |
| Specific gravity | 3.73 to 3.79 |
| Optical properties | Biaxial (+), colorless (transmitted light) |
| References | [1] |
Adelite forms variably colored (blue, green, yellow and grey) crystals in the orthorhombic crystal system. The form is typically massive. It has a Mohs hardness rating of 5 and a specific gravity of 3.73 to 3.79.
It was first described in 1891 from Värmland, Sweden. Its name comes from the Greek word for indistinct.
Geologic occurrence
Adelite has been found in ore deposits in Algeria, Germany, Italy, Sweden and the USA.[1]
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gollark: Create a new section "Bees" %bees.Create a rule "Bee utilization part 1" (%bees-1) in %bees:> The deployment status of bees is considered part of the Game State. No bee action (except for bee deployment) may be taken unless bees are currently deployed. Bee actions include deployment of bees, which makes bees become deployed, cessation of bees, which makes bees not be deployed, and use of bees against a player. The player bees are to be used against must be indicated in the Bee Poll authorizing this action. Use of bees against players causes their Points quantity to be reduced by 1, unless it is already 0, in which case there is no effect.Create a rule "Bee Poll" (%bee-poll) in %polls:> A Bee Poll is required to authorize bees to perform actions, as described in %bees. The default allowed reactions for a Bee Poll are 👍 (representing a vote for) and 👎 (representing a vote against). Bee Polls may be closed if they have existed for 12 hours or more, rather than the usual 24. If a Bee Poll is passed, the action it describes is taken. Players are permitted to use multiple reactions on a Bee Poll. A Bee Poll must clearly indicate that it is a Bee Poll.Due to the passage of proposal #207, bees are to be considered "deployed" initially.
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See also
References
 |
Look up adelite in Wiktionary, the free dictionary. |
Bibliography
- Palache, P.; Berman H.; Frondel, C. (1960). "Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)" John Wiley and Sons, Inc., New York, pp. 804-806.
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