Spinel
| ID | 361 | |
|---|---|---|
| Mineral | Spinel | |
| Location | Baikal - Zabaykalsky Krai - Russia | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Spinel information at mindat.org |
|
Mindat data
| ID | 3729 |
|---|---|
| Long ID | 1:1:3729:3 |
| Formula |
MgAl2O4
|
| IMA Status |
0 1 |
| Other Occurrences | As an accessory mineral in igneous rocks, principally basalts, peridotites, kimberlites. In marbles, pegmatites. |
| Diapheny | Transparent,Translucent |
| Tenacity | brittle |
| Colour | Black, blue, red, violet , green, brown, pink |
| Hardness (min) | 7.5 |
| Hardness (max) | 8.0 |
| Lustre | Vitreous |
| About the name | Named in 1779 by Jean Demeste from Latin "spinella", little thorn, alluding to its sharp octahedral crystals. Confused with carbuncle = ruby in former times. |
| Streak | Greyish white |
| Crystal System | Isometric |
| Cleavage Type | None Observed |
| Fracture type | Irregular/Uneven,Splintery,Conchoidal |
| Morphology | Usually octahedral; less often modified by a{010} or d{011}; dodecahedral or cubic rare. Massive, coarse-granular to compact. |
| Twinning | Common on {111} (spinel law), with twinned aggregates often flattened parallel to {111}, the composite plane. Sixlings due to repeated twinning noted. |
| Comment Luster | Splendent to dull |
| shortcode_ima | Spl |
| Group | Spinel Subgroup |
Details
Price: € 40
Dimensions: Not registered
Weight: 216 g
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Al | Aluminium | |
| Mg | Magnesium | |
| O | Oxygen |