Quartz Geode Matrix
Quartz var. Crystal Quartz on Host Rock · Mineral Specimen
Crystal System
Trigonal, with a druzy and microcrystalline geode habit lining a cavity within a host rock matrix.
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2
Formation Process
Hydrothermal and low-temperature sedimentary processes where silica-rich fluids deposit microcrystalline or macrocrystalline quartz inside cavities, vugs, or fractures within a host rock.
About This Crystal
The specimen displays a dark, rough, earthy host rock matrix featuring hollow cavities lined with sparkling, translucent to transparent white quartz crystals forming a druzy aggregate.
Physical Characteristics
Color ranges from colorless and white to grayish matrix; streak is white; cleavage is none; fracture is conchoidal; specific gravity is approximately 2.65; tenacity is brittle.
Optical Properties
Refractive index ranges from 1.544 to 1.553; uniaxial positive optical character with low birefringence; singly or doubly refractive depending on crystal orientation.
Hardness & Durability
Origin Region
Worldwide distribution, with notable specimens originating from Brazil, Madagascar, the United States, and Uruguay.
Hardness & Durability
Mohs hardness of 7; moderate toughness; excellent chemical and thermal stability; highly durable for mineral display but matrix can be friable.
Care & Maintenance
Can be safely cleaned with warm soapy water and a soft brush; avoid harsh chemicals and hydrofluoric acid; store away from softer minerals that could be scratched.
Rarity & Value
Common and widely available; value depends primarily on aesthetic appeal, matrix contrast, size of the cavity, and crystal development, typically ranging from inexpensive to moderate for fine cabinet specimens.
Special Characteristics
Sparkling druzy texture with cavity-fill (geode-like) formations reflecting light intensely.
Lore & History
Quartz has been utilized by humans for thousands of years in tools, ornaments, and sacred objects. In metaphysical practices, quartz is traditionally regarded as the 'master healer,' associated with clarity, amplification of energy, and all chakras.