Septarian is a distinctive mineral that's usually very easy to recognise. It's used primarily as a lapidary material but is also occasionally cut into cabochons for use in jewellery. Also known as a septarian nodule or concretion, it's basically a mud ball that was formed as the oceans receded many millions of years ago and it's believed that as the mud balls dried out, they subsequently cracked which allowed the yellow coloured calcite crystals to grow in the newly created void. There is however a great deal of mystery and debate about whether the mud balls cracked because they dried out or whether other forces or circumstances may have caused this to happen. This topic is often discussed in geology forums but to date, there is still no commonly accepted explanation.
Made up partly of clay means septarian tends to be slightly heavier than many other minerals but it's also well known for its magnificent glut of yellow crystallization. More accurately described as a rock, septarian is made up of calcite, aragonite and limestone.
This is one of the larger septarian spheres that we currently have available in our collection of crystals, rocks and minerals and as well as being an eye-cathching display piece, it's also remarkably tactile.
Natural mineral spheres make great gifts and septarian is a particularly good choice for anyone with an interest in the natural world and particularly paleontology.
Weight (grams): 248.8
Size (cms): 5.6 in diameter