Formula: C5H3(NH2)N4O
Organic compound
Crystal System: Monoclinic
Specific gravity: 1.485 (Webmin)
Hardness: 1 to 2
Streak: White
Colour: White
Melting point: 360oC

Cave deposits

Guanite is an organic cyclic carbon compound with additional, non-carbon atom, and an important constituent of both DNA and RNA (Mindat). It is an uncommon component of phosphatic crusts associated with guano from seabirds or bats (HOM).
Spacing change of guanine crystals in the skin of chameleons is responsible for their showcase colour change (Nature Communications volume 6, Article 6368.


At Murra-el-elevyn Cave, Cocklebiddy Roadhouse, Dundas Shire, Western Australia, guanine formed as a reaction of bat guano and urine with limestone in the cave (Dana). Associated minerals include aphthitalite, biphosphammite, brushite, gypsum, monetite, syngenite, taylorite and hannayite (HOM).

At Petrogale Cave, Madura Roadhouse, Dundas Shire, Western Australia, guanine formed in guano derived from seabirds (Dana). Associated minerals include biphosphammite, archerite, aphthitalite, halite, syngenite, stercorite, oxammite, weddellite, whitlockite, mundrabillaite, newberyite and calcite (HOM).

At the type locality, North Chincha Island, Chincha Islands, San Clemente District, Pisco Province, Ica, Peru, guanine formed in seabird guano (Mindat).

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