Coalingite (original) (raw)
Colour:
Deep reddish brown, brown, straw-yellow; golden brown in transmitted light.
Cleavage:
Distinct/Good
{0001}, perfect; another at 45°
Density:
2.32 - 2.42 g/cm3 (Measured) 2.26 g/cm3 (Calculated)
RI values:
_n_ω = 1.588 - 1.635 _n_ε = 1.560 - 1.590
δ = 0.028 - 0.045
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Comments:
0 = golden brown, dark brown; E = colorless.
Comments:
May be anomalously biaxial.
Class (H-M):
3_m_ _(_32/m ) - Hexagonal Scalenohedral
Cell Parameters:
a = 3.12 Å, c = 37.4 Å
Unit Cell V:
315.29 ų (Calculated from Unit Cell)
Morphology:
Hexagonal plates, equant grains.
Twinning:
reflection across {0001}, common
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014454 | Coalingite | Pastor-Rodriguez J, Taylor H F W (1971) Crystal structure of coalingite Mineralogical Magazine 38 286-294 |  |
1971 | New Idria serpentinite, Coalinga, California, USA | 0 | 293 |
CIF Raw Data - click here to close
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.34 Å | (100) |
| 4.20 Å | (80) |
| 6.05 Å | (50) |
| 1.558 Å | (50) |
| 13.4 Å | (40 broad) |
| 2.67 Å | (30) |
| 1.884 Å | (30) |
Comments:
Coalinga, California, USA. Data from Mumpton et al. (1965).
General Appearance of Type Material:
Soft, reddish-brown platelets, 0.1 to 0.2 mm in size.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, number 119335.
Geological Setting of Type Material:
Weathering of iron rich brucite.
Associated Minerals at Type Locality:
Reference:
Mumpton, F.A., H.W. Jaffe & C.S. Thompson (1965), Coalingite, a new mineral from the New Idria serpentinite, Fresno and San Benito counties, California: American Mineralogist: 50: 1893-1913.
Thermal Behaviour:
DTA shows endothermic peaks at 175°, 310°, and 400° C.
Notes:
Iron-rich brucite specimens transformed to coalingite in the laboratory, exposed to the atmosphere for several months.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 
- Good crystals or important locality for species. 
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.