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| Formula: |
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| System: | Orthorhombic | Colour: | light yellow, ... | |||||||||
| Lustre: | Vitreous | Hardness: | 3½ | |||||||||
| Name: | Named for Gilbert-Joseph Adam (1795-1881), French mineralogist, who supplied the first specimens. | |||||||||||
| Dimorph of: | Paradamite | |||||||||||
Classification of Adamite | ||||
| IMA status: | Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" 1866 | |||
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| Strunz 8th edition ID: | 7/B.06-30 | |||
| Strunz 9th edition ID: | 8.BB.30 | |||
| Nickel-Strunz 10th (pending) edition ID: | 8.BB.30 8 : PHOSPHATES, ARSENATES, VANADATES B : Phosphates, etc., with additional anions, without H2O B : With only medium-sized cations, (OH, etc.):RO4 about 1:1 | |||
| Dana 7th edition ID: | 41.6.6.3 | |||
| Dana 8th edition ID: | 41.6.6.3 41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN 6 : A2(XO4)Zq | |||
| Hey's CIM Ref.: | 20.3.1 20 : Arsenates (also arsenates with phosphate, but without other anions) 3 : Arsenates of Zn, Cd or Hg | |||
| mindat.org URL: | http://www.mindat.org/min-21.html Please feel free to link to this page. | |||
Type Occurrence of Adamite | ||||
| Type Locality: | Chañarcillo, Copiapó Province, Atacama Region, Chile | |||
| Year of Discovery: | 1866 | |||
| Associated Minerals at type locality: |
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Occurrences of Adamite | ||||
| Geological Setting: | Secondary mineral in arsenic bearing zinc deposits | |||
Physical Properties of Adamite | ||||
| Lustre: | Vitreous | |||
| Diaphaneity (Transparency): | Transparent, Translucent | |||
| Colour: | light yellow, honey-yellow, brownish yellow, pale green, yellowish green, rarely colourless; colourless or faintly tinted in yellow, green, rose, etc. in transmitted light. | |||
| Streak: | white | |||
| Hardness (Mohs): | 3½ | |||
| Hardness Data: | Measured | |||
| Tenacity: | Very brittle | |||
| Cleavage: | Distinct/Good on {101}, good; on {010}, poor. | |||
| Fracture: | Irregular/Uneven, Conchoidal | |||
| Density (measured): | 4.32 - 4.48 g/cm3 | |||
| Density (calculated): | 4.435 g/cm3 | |||
Crystallography of Adamite | ||||
| Crystal System: | Orthorhombic | |||
| Class (H-M): | mmm (2/m 2/m 2/m) - Dipyramidal | |||
| Space Group: | Pnnm {P21/n 21/n 2/m} | |||
| Cell Parameters: | a = 8.304Å, b = 8.524Å, c = 6.036Å | |||
| Ratio: | a:b:c = 0.974 : 1 : 0.708 | |||
| Unit Cell Volume: | V 427.25 ų (Calculated from Unit Cell) | |||
| Z: | 4 | |||
| Morphology: | Crystals of variable morphology. Often elongated [010], also elongated [001], rarely elongated [100]. Tabular at times {101} or equant. Commonly forms radial aggregates, fanlike rosettes or crystalline crusts. | |||
| Crystal Atlas: | Image Loading
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