Quartz with Limonite/Goethite Matrix
Quartz var. Rock Crystal on Limonite Matrix · Mineral Specimen
Crystal System
Trigonal (Quartz) and Orthorhombic/Amorphous (Goethite/Limonite)
Mineral Group
Silicates (Tectosilicates) and Oxides/Hydroxides
Chemical Formula
SiO2 (Quartz) with FeO(OH)*nH2O (Goethite/Limonite)
Formation Process
Hydrothermal vein deposition and secondary weathering processes
About This Crystal
An earthy, highly textured mineral specimen featuring a rugged, brownish-yellow limonite or goethite matrix interspersed with crystalline cavities, flanked by translucent to transparent quartz crystal formations along the edges.
Physical Characteristics
Color ranges from earthy yellow-brown to dark brown and clear; streak is yellowish-brown for the matrix and white for quartz; hardness varies from 5 for limonite to 7 for quartz; uneven to conchoidal fracture.
Optical Properties
Quartz is uniaxial positive with vitreous luster; limonite matrix is earthy to sub-metallic and opaque.
Hardness & Durability
Origin Region
Worldwide distribution; notable specimens from Brazil, Arkansas (USA), and Madagascar
Hardness & Durability
Variable; quartz is 7 on the Mohs scale, while the limonite matrix is softer (around 4-5) and more friable.
Care & Maintenance
Clean with gentle warm soapy water using a soft brush; avoid harsh acids or prolonged soaking due to the porous nature of the matrix.
Rarity & Value
Common to uncommon depending on aesthetic quality and crystal size; highly prized by mineral collectors for contrast matrix displays.
Special Characteristics
Features striking textural contrast between rough, earthy iron hydroxide matrix and sharp, light-reflecting quartz termination points.
Lore & History
Used in crystal healing for grounding and clarity; quartz amplifies energy while earthy matrices are associated with root chakra grounding and stability.