石炭岩や砂石、疑灰石は花崗岩に比べ摩擦しやすく
耐久性も低い。
摩擦性
Warning: count(): Parameter must be an array or an object that implements Countable in /home/aimoku01/kominka-tottori.org/public_html/wp/wp-content/themes/biz-vektor/single.php on line 47
Warning: count(): Parameter must be an array or an object that implements Countable in /home/aimoku01/kominka-tottori.org/public_html/wp/wp-content/themes/biz-vektor/single.php on line 47
