The larger crystals on this rock are about 1 cm in length.
| Mineral Type | Calcite – CaCO3 Magnetite (Matrix) – Fe+2Fe+32O4 |
| Size | 15 x 16 x 8 cm |
| Collection ID | 09062103J |
| Collection Location | Near Comstock Mine, Iron Springs County, Utah, USA 37:36.874 N 113:23.576 W |
| Collection Date | June 21, 2009 |
| Testing Results | Crystals: Acetic Acid: Positive Reaction Streak: Colorless Hardness: 3Magnetite: Magnetism: Positive, weak Streak: Dark Gray Hardness: 3-6 |