Whakarewarewa geysers, Rotorua. White silica (SiO2) sinter deposits are formed as dissolved material is precipitated on cooling.
Champagne Pool, Waiotapu, near Rotorua. Silica sinter (white) also has encrustations of arsenic-rich mineral material (orange) deposited from cooling water. Arsenic is a common pollutant in streams draining thermal areas.
Related
Introduction
Overview: Geological setting for Metals in the New Zealand environment
- Epithermal Gold
- Mesothermal Gold
- Acid Rock drainage
- Coal
- Metals in groundwater
- Alluvial Gold
- Northland Mercury
- Hot Springs (in heavy metals)
Metalloids
Heavy Metals
- Heavy metal discharge from fossil hot springs
- Host Rock alteration
- Active analogies for old hot spring systems
- Sinter
- Mine Tailings
- Weathering and alteration