Anhydrite
| ID | 26 | |
|---|---|---|
| Mineral | Anhydrite | |
| Location | Naica - Chihuahua - Mexico | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Anhydrite information at mindat.org |
|
Mindat data
| ID | 234 |
|---|---|
| Long ID | 1:1:234:1 |
| Formula |
Ca(SO4)
|
| IMA Status |
0 1 |
| Other Occurrences | Sedimentary evaporite deposits, cap rock of salt domes. |
| Discovery Year | 1804 |
| Diapheny | Transparent,Translucent |
| Cleavage | On {010} perfect; on {100} nearly perfect; on {001} good to imperfect. |
| Tenacity | brittle |
| Colour | Colourless, bluish, blue-grey, violet, burgundy-red, white, rose-pink, brownish, reddish, grey, dark grey; colourless in transmitted light |
| Hardness (min) | 3.0 |
| Hardness (max) | 3.5 |
| Lustre | Vitreous, greasy |
| About the name |
Named in 1804 by Abraham Gottlob Werner from the Greek άνυδρος ("anhydros") meaning "without water", in allusion to the lack of water in its composition, in contrast to |
| Streak | White, off-white, greyish |
| Crystal System | Orthorhombic |
| Cleavage Type | Perfect |
| Fracture type | Irregular/Uneven,Splintery |
| Morphology | Crystals equant, or nearly so, with large pinacoidal faces. Also thick tabular on {010}, {100}, or {001}; elongated [100] or [001]. Massive. Fine granular to scaly; fibrous (either parallel, radiated or plumose) and frequently curved. Contorted concretionary forms (bowel stone). |
| Twinning | 1.) On {011} as contact twins and polysynthetic lamellae (may be produced by heating or pressure); 2.) On {120} as contact twins, rare. |
| UV | Can show fluorescence under LW and/or SW. For example: bluish white response to SW: https://www.mindat.org/photo-1254482.html |
| Thermal Behaviour | Inverts to α-CaSO4 at 1193°C. Melting Point = ~ 1450°C. Before the blowpipe, fuses at 3, coloring the flame reddish yellow, giving an enamel-like bead which reacts alkaline. |
| Comment Luster | Pearly on {010} |
| shortcode_ima | Anh |
Details
Price: € 5
Dimensions: Not registered
Weight: Not registered
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Ca | Calcium | |
| O | Oxygen | |
| S | Sulfur |