In recent years, growing environmental concerns have led the cement industry to make modifications in cement production, manifested by the use of supplementary cementitious materials (SCMs) as raw materials within the cement mixture. In the present study the use of dolomite-based quarry-dust (QD) to generate a low-energy, environmentally-friendly structural material was explored. QD was added either as an additive to conventional Portland Cement (PC) or to geopolymeric binders, formed by the alkali activation of local class F fly ash (FA). A significant increase in compressive strength, due to QD addition, was found for both CEM- and FA- based mixtures . The chemical durability of the cementitious systems and FA-based geopolymeric mixtures for which the binder (cement/FA) was replaced with 40% wt. QD was evaluated using two different tests: (a) Expansion tests to assess the durability of these dolomite-based, Mg-rich mixtures - as brucite (Mg(OH)2) may be formed according to Eq. (1) (known as the ‘alkali-carbonate reaction’) and hence induce volume increase and expansion.