Macaulayite
... that the only known source of the mineral Macaulayite in the world is in a quarry at the foot of Bennachie, Aberdeenshire – but it may also be present on Mars?
... that the only known source of the <a href="./Mineral" id="mwDyw" rel="mw:WikiLink" title="Mineral">mineral</a> <b id="mwDy0"><a href="./Macaulayite" id="mwDy4" rel="mw:WikiLink" title="Macaulayite">Macaulayite</a></b> in the world is in a quarry at the foot of <a href="./Bennachie" id="mwDy8" rel="mw:WikiLink" title="Bennachie">Bennachie</a>, <a href="./Aberdeenshire" id="mwDzA" rel="mw:WikiLink" title="Aberdeenshire">Aberdeenshire</a> – but it may also be present on <a href="./Mars" id="mwDzE" rel="mw:WikiLink" title="Mars">Mars</a>?