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The tuffs, which were used in the Yerevan region in historical times, belong to the varieties of the Hoktemberyan Brown (HB) and the Hoktemberyan Red (HR) or the Hoktemberyan Black (HBl). Basalt is partly found at the Zvartnots Cathedral and can be compared with the Armenia Black (AB) variety. A detailed description of all building stones is given in Pötzl et al. 2018.

The porosity of the building stones ranges between 14.1–35.6 %, the particle density between 2.46 and 2.93 g/cm³ (Tab. 1). The porosity of the different mortars differs between 31.3 and 47.6 %, with densities between 1.2 and 1.7 g/cm³. Their particle densities range between 2.2 and 2.6 g/cm³ (Tab. 1).

Table 1: Porosity and density of the investigated stone and mortar samples. * Pötzl et. al 2018

Sample	Porosity (%)	Density (g/cm3)	Particle density (g/cm3)
HB*	35.0	1.62	2.49
HR*/Bl	35.6	1.59	2.46
AB*	15.9	2.25	2.67
ZM	31.3	1.78	2.60
AM	43.4	1.29	2.28
RM	47.6	1.28	2.45