päevakivi

Päevakivi is the Estonian word for the gemstone commonly known as sunstone. It is a feldspar mineral, specifically a plagioclase feldspar, that exhibits a sparkling, glittery effect due to inclusions of mineral flakes. These inclusions are typically hematite or goethite, which are iron oxides. When light hits these inclusions, it is reflected back, creating a distinctive shimmering or aventurescent appearance, similar to aventurine, though the effect is different.

The color of päevakivi can range from a pale yellow to a reddish-brown or orange, depending on the specific mineral composition and the nature of the inclusions. The sparkle is often described as coppery or golden. This natural phenomenon is what gives sunstone its name and its appeal as a gemstone.

Historically, sunstone has been used in jewelry and ornamental objects. In some cultures, it was believed to have protective or healing properties, often associated with the sun's energy. The term "päevakivi" directly translates to "day stone" or "sun stone" in Estonian, reflecting its bright and radiant appearance. While not as rare or valuable as some other gemstones, päevakivi is appreciated for its unique optical effect and natural beauty. It is found in various locations worldwide, with notable deposits in Norway, the United States, and India.