Gypsum
| ID | 149 | |
|---|---|---|
| Mineral | Gypsum | |
| Location | Lubin - Woiwodschap Neder-Silezië - Poland | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Gypsum information at mindat.org |
|
Mindat data
| ID | 1784 |
|---|---|
| Long ID | 1:1:1784:4 |
| Formula |
Ca(SO4) · 2H2O
|
| IMA Status |
0 1 |
| Other Occurrences | Commonest of the sulphate minerals, gypsum is found in marine evaporites, in caves where the air is dry enough to allow it to be deposited and remain, at fumaroles, and in the oxidized zones of sulfide deposits on occasion. |
| Industrial | Plaster, plasterboard. |
| Diapheny | Transparent,Translucent,Opaque |
| Cleavage | Perfect (eminent) and easy on {010}, almost micaceous in some samples; on {100} distinct, yielding a surface with a conchoidal fracture; on {011}, yielding a fibrous fracture {001}. |
| Tenacity | flexible |
| Colour | Colourless to white, often tinged other hues due to impurities; colourless in transmitted light. |
| Hardness (min) | 2.0 |
| Hardness (max) | 2.0 |
| About the name | First known mention is by Theophrastus about 300-325 BCE from the Greek γυψοζ (gypsos) meaning plaster. |
| Streak | White. |
| Crystal System | Monoclinic |
| Cleavage Type | Perfect |
| Fracture type | Splintery,Conchoidal |
| Morphology |
Thin to thick tabular crystals, {010} with |
| Twinning |
{100} ("swallow-tail"), very common, with a re-entrant angle formed ordinarily by |
| UV | Common and varied. Most common colours of fluorescence are baby-blue and shades of golden yellow to yellow. Selenite crystals often exhibit zoned "hourglass" fluorescence in zones that may, or may not, be evident in ordinary light. |
| Thermal Behaviour | Dehydrates and turns white. Heated in a closed tube, it gives off water and becomes opaque. Fuses at 2.5-3, coloring the flame reddish yellow. |
| Comment Luster | Wide range of luster based on varieties, pearly on {010} |
| shortcode_ima | Gp |
| Group | Gypsum Supergroup |
Details
Price: € 20
Dimensions: Not registered
Weight: 229 g
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Ca | Calcium | |
| H | Hydrogen | |
| O | Oxygen | |
| S | Sulfur |
