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|Name:||Named for the type locality, Niah Great Cave, Sarawak, Malaysia|
Note: Artificially grown "niahite" is sold on the market. It is in fact ammonium dihydrogen phosphate (ADP), also called mono ammonium phosphate (MAP), formula NH4H2PO4. These fakes can be either colored bright green by doping with chromium or in any color by adding water soluble dyes like food coloring (Udo Behner info). The matrix may consist of quartz crystals or any other rock.
Classification of Niahite
|IMA status:||Approved 1977|
|Strunz 8th edition ID:||7/C.23-30|
|Strunz 9th edition ID:||8.CH.20|
|Nickel-Strunz 10th (pending) edition ID:||8.CH.20|
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
H : With large and medium-sized cations, RO4:H2O < 1:1
|Dana 8th edition ID:||188.8.131.52|
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
1 : AB(XO4)·xH2O
|Hey's CIM Ref.:||19.12.5|
19 : Phosphates
12 : Phosphates of Mn
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Type Occurrence of Niahite
|Type Locality:||Niah Great Cave (Gunong Jerneb), Sarawak, Borneo Island, Malaysia|
|General Appearance of Type Material:||fine radiating and sub-parallel clusters of crystals up to 0.5mm in size|
|Place of Conservation of Type Material:||West Australian Government Chemical Laboratories, Perth, Australia ; the Malaysian Geological Survey in Kuching;the Bureau of Mineral Resources, Canberra, Australia|
|Geological Setting of type material:||cave|
|Associated Minerals at type locality:|
Physical Properties of Niahite
|Density (measured):||2.39 g/cm3|
|Density (calculated):||2.437 g/cm3|
Crystallography of Niahite
|Class (H-M):||mm2 - Pyramidal|
|Cell Parameters:||a = 5.68Å, b = 8.78Å, c = 4.88Å|
|Ratio:||a:b:c = 0.647 : 1 : 0.556|
|Unit Cell Volume:||V 243.37 Å³ (Calculated from Unit Cell)|
|X-Ray Powder Diffraction:|
Optical Data of Niahite
|RI values:||nα = 1.582 nβ = 1.604 nγ = 1.609|
|2V:||Measured: 54° , Calculated: 50°|
|Maximum Birefringence:||δ = 0.027|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r < v moderate|
Chemical Properties of Niahite
|Essential elements:||H, Mn, N, O, P|
|All elements listed in formula:||H, Mg, Mn, N, O, P|
Relationship of Niahite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Niahite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Niahite
Mineralogical Magazine (1983): 47: 79-80.
American Mineralogist (1984): 69: 408.
Doklady Akademii Nauk SSSR (1995) 342: 40.
Internet Links for Niahite
Localities for Niahite
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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