There is an even wider range in morta performance than there is in briar, from what I've experienced.
Harder and denser - The black morta I work with is much harder than briar. It's more resilient to burn-out by a long stretch. It is not cooler smoking, however - To the tongue, it's about the same. Finger-wise, it gets hotter to touch, but also cools back down faster... A bit like a thick-walled clay, really. This tan morta I just made performs similarly but doesn't seem to get as hot - Then again, it's much larger and thicker walled than most of the small black mortas I've made, so that's certainly a factor.
Weight - The black material is heavier than briar. The tan material is lighter than briar. If I were to hazard a guess, I'd say it might even be lighter than Turkish meerschaum, but I haven't done any side-by-side weighings.
Harder and denser - The black morta I work with is much harder than briar. It's more resilient to burn-out by a long stretch. It is not cooler smoking, however - To the tongue, it's about the same. Finger-wise, it gets hotter to touch, but also cools back down faster... A bit like a thick-walled clay, really. This tan morta I just made performs similarly but doesn't seem to get as hot - Then again, it's much larger and thicker walled than most of the small black mortas I've made, so that's certainly a factor.
Weight - The black material is heavier than briar. The tan material is lighter than briar. If I were to hazard a guess, I'd say it might even be lighter than Turkish meerschaum, but I haven't done any side-by-side weighings.