# melanothallite

> English word · Noun

## Definitions
1. An orthorhombic-dipyramidal mineral containing chlorine, copper, and oxygen.

## Etymology
From Ancient Greek μελανός (melanós, “black”) and θαλλός (thallós, “young/green twig”), because when the mineral is exposed, it turns from black to green.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/melanothallite