Pectolite

  Pectolite is a white to gray mineral, NaCa₂Si₃O₈(OH), sodium calcium inosilicate hydroxide. It crystallizes in the triclinic system typically occurring in radiated or fibrous crystalline masses. It has a Mohs hardness of 4.5 to 5 and a specific gravity of 2.7 to 2.9. The gemstone variety, larimar is a pale to sky blue.

Additional recommended knowledge

What is the Correct Way to Check Repeatability in Balances?

Guide to balance cleaning: 8 simple steps

Correct Test Weight Handling Guide: 12 Practical Tips

It was first described in 1828 at Mt. Baldo, Trento Province, Italy. It is found in basaltic rocks associated with various zeolites, prehnite, calcite, datolite, sugilite, fluorite, and serpentine. It is found in a wide variety of worldwide locations.

References

• Mindat w/ localities
• Webmineral
• Mineral galleries