Hearth blocks are blocks which can be crafted or found in various structures containing fireplaces, such as taverns, mead halls, houses, as well as on the top of obelisks.
This block shares the properties of netherrack in that a fire lit on one will never burn out, making them a useful and easily obtainable alternative for creating fireplaces while in Middle-earth. In renewed they also have an animated texture when they are lit, as seen in the infobox.
Apart from decoration, hearth blocks in renewed can also be used as the only way to produce Soul Fire in Middle-earth (though with a scientific explanation). To do this, simply throw some Blue Vitriol onto a lit hearth block and the flames will turn blue (as shown to the left).