How to add font icons before navigation menu items in Genesis using Dashicons. http://sridharkatakam.com/add-font-icons-navigation-menu-items-genesis-using-dashicons/

functions.php

//* Enqueue Dashicons
add_action( 'wp_enqueue_scripts', 'enqueue_dashicons' );
function enqueue_dashicons() {
	wp_enqueue_style( 'dashicons' );
}

style.css

.nav-header li > a:before {
	-webkit-font-smoothing: antialiased;
	font: normal 20px/1 'dashicons';
	vertical-align: middle;
	padding-right: 4px;
	display: inline-block;
}

.nav-header li > a:hover:before {
	text-decoration: none;
}

.nav-header li.sample > a:before {
	content: "\f313";
}

.nav-header li.layouts > a:before {
	content: "\f181";
}

.nav-header li.templates > a:before {
	content: "\f116";
}

.nav-header li.contact > a:before {
	content: "\f466";
}