Quartz Vein in Basalt or Slate
Quartz Vein in Metamorphic or Volcanic Host Rock · Mineral Specimen / Rock Specimen
Crystal System
Trigonal (Quartz component) with massive habit
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (Quartz) with variable host rock composition
Formation Process
Hydrothermal activity where silica-rich fluids filled a fracture in a pre-existing host rock, followed by weathering and water-tumble smoothing
About This Crystal
A water-worn, smooth pebble featuring a dark grey to black host rock intersected by a distinct, contrasting white-to-beige quartz vein running through the middle
Physical Characteristics
Dark grey to black host matrix with a white crystalline quartz band; streak is white; uneven fracture; Mohs hardness varies around 7 for the quartz vein and 5-6 for the host rock
Optical Properties
Opaque host rock with translucent to opaque quartz vein; singly or doubly refractive depending on the specific mineral component
Hardness & Durability
Origin Region
Found globally in regions with tectonic activity, hydrothermal vein systems, and water-worn pebble deposits
Hardness & Durability
Host rock typically around 5-6, quartz vein is 7 on the Mohs scale; durable as a water-worn pebble suitable for handling
Care & Maintenance
Wash gently with warm soapy water and a soft brush; avoid harsh acids if the host rock contains carbonate minerals
Rarity & Value
Very common; low commercial value, primarily collected as a geological curiosity or natural specimen
Special Characteristics
Displays a striking natural banded or veined pattern created by hydrothermal fracture infilling
Lore & History
Often viewed in metaphysical practices as a stone of integration, balancing opposites, and bridging gaps between different energies, though these are traditional beliefs rather than scientific claims