Where is Ruby in matrix found?
Corundum (Al2O3) in host rock
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Open the appRuby in matrix occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Ruby in matrix
Mogok, Myanmar (Burma)
Famous for producing some of the finest 'pigeon's blood' rubies, often found in marble matrix.
Jagdalek, Afghanistan
Known for rubies and sapphires found in marble.
Mozambique
A significant source of rubies, often found in amphibolite or marble matrix.
Tanzania (e.g., Winza, Longido)
Produces rubies in various matrices, including zoisite (often called 'Anyolite' when ruby is present), amphibolite, and marble.
Madagascar
Various ruby deposits, often in metamorphic rocks like gneiss or amphibolite.
North Carolina, USA
Historical ruby occurrences in metamorphic rocks, particularly in the Cowee Valley.
Collecting tips
- Geological Context. Focus on areas known for metamorphic rocks (marbles, schists, gneisses) or specific igneous intrusions (alkaline basalts, pegmatites) that are associated with corundum formation. Look for geological maps indicating such formations.
- Associated Minerals. Rubies are often found with minerals like phlogopite, spinel, graphite, pargasite, zoisite, and various feldspars. Identifying these associated minerals in the matrix can indicate the presence of ruby.
- Color and Hardness. Look for distinct red crystals that are significantly harder than the surrounding matrix. Ruby has a Mohs hardness of 9, which will scratch most common matrix minerals.
- Crystal Shape. Identify the characteristic hexagonal or barrel-shaped crystal habit of corundum within the host rock.
- Weathering and Erosion. In alluvial deposits, rubies are found as weathered-out crystals. However, for 'in matrix' specimens, focus on primary deposits where the host rock is still intact.
Quick Check
- Color:
- Red crystals (ruby) embedded in a contrasting host rock (e.g., white, grey, green, black).
- Luster:
- Vitreous to adamantine for ruby; variable for matrix.
- Streak:
- White (for ruby); variable for matrix minerals.
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