Hydrated normal phosphate, manganese-bearing mineral
Specific gravity: 2.39
Hardness: 1 to 2
Colour: Pale orange
At the type locality, the Niah Great Cave, Miri Division, Sarawak, Malaysia, niahite occurs in a limestone cave as fine radiating and sub-parallel clusters of crystals up to 0.5mm in size, derived from the breakdown of bat guano. Associated minerals include newberyite, collophane, hannayite, struvite, variscite, whitlockite, vivianite, taranakite, strengite, quartz, opal, monetite, leucophosphite, gypsum, brushite and ardealite (HOM, Mindat).
At the Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USA, niahite is associated with newberyite, sussexite and pyrochroite (HOM).
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