CORE BIT SELECTOR

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ROCK DESCRIPTION		HARDNESS	GEOTECHNICAL			SURFACE SET BITS					IMPREGNATED BITS
			Saw tooth	PDC	Geo Cube	Stones Per Carat					Matrix Type
						10/15	20/25	30/40	40/60	60/80	GVH	GH	GM	GS
1	Chalk	SOFT	.
	Claystone		.
	Gypsum		.
	Soft Limestone			.
2	Loose Sandstone	SOFT TO MEDIUM		.
	Marl				.
	Med Limestone					.	.
	Salt						.	.
	Sand							.
	Shale							.
3	Claystone	MED-HARD LOW ABRASIVE						.	.
	Sandy Limestone								.
	Sandy Shale								.
	Soft Sandstone								.
	Soft Schist								.		.	.
4	Hard Shale	MED-HARD ABRASIVE				.			.	.		.
	Med Limestone					.				.			.
	Med Sandstone					.				.			.
	Siltstone					.				.			.
5	Hard Limestone	HARD ABRASIVE				.							.
	Schist		.			.							.
	Dolomites		.			.							.
	Serpentine		.			.								.
6	Andesites	HARD NON-ABRASIVE	.			.								.
	Diabase		.			.								.
	Dolomites		.			.					.			.
	Hard Schist		.								.			.
	Magnetite		.								.			.
	Marble		.								.			.
	Pegmatites		.								.			.
	Siliceous Limestone		.								.			.
	Syenites		.								.			.
7	Amphibolite	VERY HARD	.
	Basalts		.
	Diorites		.
	Gabbro		.
	Gneiss		.
	Granites		.
	Leptite		.
	Metamorphic Schist		.
	Porphyry		.
	Quartzites		.
	Rhyolites		.
	Trachytes		.
8	Cherts	ULTRA HARD	.
	Conglomerate		.
	Jaspers		.
	Taconite		.
	Abrasive Sandstone		.									.
	Abrasive Quartz		.									.

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