Crocoite
| ID | 241 | |
|---|---|---|
| Mineral | Crocoite | |
| Location | Tasmanie - Australia | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Crocoite information at mindat.org |
|
Mindat data
| ID | 1157 |
|---|---|
| Long ID | 1:1:1157:6 |
| Formula |
Pb(CrO4)
|
| IMA Status |
0 1 |
| Other Occurrences | Uncommon secondary mineral in lead deposits associated with chromium-bearing rocks. |
| Diapheny | Transparent,Translucent |
| Cleavage | Distinct on {110}, indistinct on {001} and {100}. |
| Tenacity | brittle |
| Colour | Orange, red, yellow; orange-red in transmitted light. |
| Hardness (min) | 2.5 |
| Hardness (max) | 3.0 |
| Lustre | Adamantine, vitreous |
| About the name | Originally recognized by Mikhail Vassil’evich Lomonosov in 1763 as a red lead ore. Johann Gottlob Lehmann in 1766 named it Nova Minera Plumbi. Various authors later gave the mineral a name signifying the presence of lead and the color red: minera plumbi rubra (Wallerius, 1778), Rothes bleierz (Werner, 1774), and Plomb rouge (Macquart, 1789). After the element chromium was announced in 1798, a new series of names was applied to the species: Plomb chromaté (Haüy, 1801), Kallochrom (Hausmann, 1813), etc. Renamed Crocise by François Sulpice Beudant in 1832 and Krokoisite by Franz von Kobell in 1838. Translated to the current pronunciation, Krokoit, by Johann August Breithaupt in 1841. Named Beresofite in 1844 by Charles Upham Shepard. Named Lehmannite by Henry J. Brooke and William H. Miller in 1852. The name crocoite comes from the Greek κρόκος "crocon" = saffron, alluding to the saffron-orange color of its powder. |
| Streak | Yellow-orange |
| Crystal System | Monoclinic |
| Cleavage Type | Poor/Indistinct |
| Fracture type | Conchoidal |
| Morphology |
Crystals commonly prismatic [001] to acicular crystals with nearly square outline; elongated parallel to |
| UV | Not fluorescent in UV. |
| key_elements |
0 1 |
| shortcode_ima | Crc |
Details
Price: € 20
Dimensions: Not registered
Weight: Not registered
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Cr | Chromium | |
| O | Oxygen | |
| Pb | Lead |
|