Unnamed (Ca-Mg Arsenate II)
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Formula:
(Ca, Mg, H, AsO4)
Soft aggregates of randomly oriented minute acicular crystals; associated with picropharmacolite.
"Dehydration of the phase, proceding already at room temperature, results in picropharmacolite. The probably irreversible process may take in a dry and relatively warm environment some months to years. However, the phase J-252 was identified also in a specimen kept in collection for over 100 years." (Ondruš et al., 1997).
"Dehydration of the phase, proceding already at room temperature, results in picropharmacolite. The probably irreversible process may take in a dry and relatively warm environment some months to years. However, the phase J-252 was identified also in a specimen kept in collection for over 100 years." (Ondruš et al., 1997).
Unique Identifiers
Mindat ID:
7662
Long-form identifier:
mindat:1:1:7662:9
Chemistry of Unnamed (Ca-Mg Arsenate II)
Mindat Formula:
(Ca, Mg, H, AsO4)
Element Weights:
| Element | % weight |
|---|---|
| Ca | 100.000 % |
Calculated from ideal end-member formula.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.95 Å | (100) |
| 10.05 Å | (12) |
| 7.92 Å | (33) |
| 6.77 Å | (14) |
| 5.96 Å | (7) |
| 5.596 Å | (4) |
| 5.374 Å | (5) |
| 4.966 Å | (14) |
| 4.330 Å | (13) |
| 3.988 Å | (8) |
| 3.956 Å | (15) |
| 3.794 Å | (23) |
| 3.551 Å | (46) |
| 3.398 Å | (11) |
| 3.330 Å | (7) |
| 3.246 Å | (34) |
| 3.144 Å | (8) |
| 3.067 Å | (16) |
| 2.955 Å | (32) |
| 2.804 Å | (26) |
| 2.708 Å | (16) |
| 2.599 Å | (8) |
| 2.523 Å | (8) |
| 2.432 Å | (3) |
| 2.206 Å | (10) |
| 2.104 Å | (4) |
| 1.991 Å | (7) |
| 1.938 Å | (2) |
| 1.897 Å | (7) |
| 1.786 Å | (3) |
| 1.747 Å | (6) |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Unnamed (Ca-Mg Arsenate II)
mindat.org URL:
https://www.mindat.org/min-7662.html
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References for Unnamed (Ca-Mg Arsenate II)
Localities for Unnamed (Ca-Mg Arsenate II)
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Ondruš et al. (1997) |
| Ondruš et al. (1997) |
