Every opening in this specimen marks a spot where another mineral used to be.
Quartz grew over a framework of anhydrite crystals, and when the anhydrite later disappeared, it left the quartz behind as a lattice of angular cavities that keep the shape of the original crystals. Mineralogists call this a pseudomorph, a word that means false form. It was mined in Rio Grande do Sul, Brazil, and at about 11 inches across and 33 pounds it is a true centerpiece for a collector's cabinet, a library, a lobby or a large coffee table. The open structure looks different from every angle and rewards a close look with a flashlight. It makes a memorable gift for a geologist, a mineral collector or anyone who appreciates natural history. This is the exact specimen shown.
The specimen is about 11 by 9.5 by 9 inches and weighs about 33 pounds (about 15 kilograms).
About Quartz Pseudomorphs after Anhydrite
A pseudomorph is a mineral that keeps the outward form of another mineral; the name means false form. In an incrustation pseudomorph, one mineral coats another, the inner mineral dissolves, and the outer shell keeps the original shape. Anhydrite is calcium sulfate that forms mainly in evaporite deposits and readily absorbs water, altering to gypsum.
Stone Meaning: Clear quartz is traditionally associated with clarity and focus.
Additional Details
- You receive the exact quartz pseudomorph specimen shown.
- About 11" x 9.5" x 9"; about 15kg (33 lb).
- Origin: Rio Grande do Sul, Brazil.
- Heavy; lift with two hands from the base, not by the crystal edges.
- Thin cavity walls can chip; dust with a soft brush or compressed air.
- Photos show the actual piece.
Shipping and Returns
- Carefully packed in reinforced packaging made to protect fragile crystals and minerals in transit.
- We have shipped delicate stones for years, and every order is packed with that experience.
- Covered by our 30-day return policy.
Disclaimer: Please consult a healthcare professional for any medical advice. The information provided is not intended to diagnose, treat, cure, or prevent any disease or condition.
