is a Sodium Iron Silicate with formula NaFeSi2O6 and hardness of 6-6.5.
Is an opaque mineral,often with small pits or fibrous structure. Most famous are the crystals from Malawi,but it is found also in other location in the world . This stone here comes from Mt. St. Hilaire Quebec, Canada.
Size: 10.8x8x3.8 mm.
Weight: 3.40 ct.