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Many hydroxides are rather soft but there are a few exceptions that might be pretty useful as structural building materials.

Hydroxides of aluminum

Decently hard iron and manganese hydroxides

Macroscopic flawless AP single crystals of these minerals are most likely intransparent in the visible spectrum.
In nature these iron hydroxide minerals occur in the rock limonite.

Soft hydroxides of earth alkali metals

The hydroxides of alkali metals (sodium and potassium - NaOH & KOH) are highly water soluble and form highly basic solutions aggressive to human skin and dangerous to the eyes. They are not suitable for surface exposed building materials.

Hydroxides of more rare elements

  • CrOOH Guyanaite Bracewellite Grimaldiite -- Mohs ??
  • GaO(OH) Tsumgallit Mohs 1-2 (very soft and containing rare gallium)
  • Vanadium hydroxides: V3O4(OH)4 Doloresite


Many hydroxides can be found in the Bauxite Laterite mineral group. Bauxite is today (2016) the primary aluminium ore. With todays non AP technology it's not economically possible to extract aluminium from rocks containing silicon which is the second most common element in earths crust after oxygen. With advanced atomically precise gem-gum-technology red mud could become a better usable resource.

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