1 dumortierite tumbled stone / medium

It looks like you might be referring to **dumortierite**, a mineral that is sometimes misspelled as "dumortorite." Here’s an overview of this fascinating mineral:
### **Dumortierite: Overview**
- **Chemical Formula**: \( Al_7BO_3(SiO_4)_3O_3 \)  
- **Crystal System**: Orthorhombic  
- **Color**: Typically blue (ranging from light to deep shades), but can also be violet, pink, brown, or green.  
- **Hardness**: 7–8.5 on the Mohs scale (quite hard).  
- **Luster**: Vitreous to dull.  
- **Transparency**: Opaque to translucent.  
### **Properties & Characteristics**
- Dumortierite is an aluminum borosilicate mineral, often found in **metamorphic rocks** (such as schists and gneisses) and **pegmatites**.
- It is sometimes confused with **sodalite** or **lapis lazuli** due to its blue color, but it lacks the gold pyrite flecks seen in lapis.
- When cut and polished, it can be used as a **semi-precious gemstone** in jewelry.
### **Occurrence & Sources**
Dumortierite is found in several locations worldwide, including:
- **France** (where it was first discovered in the 19th century, named after French paleontologist **Eugène Dumortier**)
- **USA** (Nevada, California, New York)
- **Brazil**
- **Madagascar**
- **Canada**
- **Sri Lanka**
- **Namibia**
### **Uses**
1. **Gemstone & Jewelry** – Often cut into cabochons or beads.
2. **Decorative Stone** – Used in carvings and ornamental objects.
3. **Metaphysical Beliefs** – Some believe it enhances patience, organization, and mental clarity (though these claims are not scientifically proven).
### **Interesting Facts**
- Dumortierite quartz is a variety of quartz that contains blue dumortierite inclusions, giving it a striking blue appearance.
- It is not as well-known as other blue minerals like sapphire or lapis, making it a unique choice for collectors.