Specimen of the weekMineral · Arsenates
Adamite
Adamite is a zinc arsenate hydroxide mineral with the formula Zn₂(AsO₄)(OH). It is not an everyday rock-forming mineral.
- Mohs hardness
- 3.5
- Chemical formula
- Zn₂(AsO₄)(OH)
- Crystal system
- Orthorhombic
Geology,
explained.
Clear essays and videos on how the Earth actually works.
Tap a numbered marker to read what it shows.
1Unconformity
A buried erosion surface. The beds below were folded, faulted and worn down before the flat-lying younger beds settled on top — a gap in the record.
Unconformity in the glossary2Normal fault
A break where the crust stretched. The block on the right slid down along the fault plane, offsetting every layer it cuts.
Normal fault in the glossary3Dyke
A sheet of once-molten rock. Magma forced its way up through the older layers and cooled in place, cutting across them.
Dike in the glossary
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Hello! I make Geoscopy: videos and long-form essays about how the Earth actually works. The geology I grew up reading was either locked in textbooks nobody outside the field opens, or chopped into 30-second clips that miss the point. Geoscopy is what I wanted instead: the real science, explained clearly, without oversimplifications.
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Feldspar
Gneiss
Chlorite
Limestone
Monazite
Bauxite
Schist
Scorodite
Scheelite
Galena
Adamite
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