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Spiky Radiating Strontianite

The Mineral strontianite

Strontianite is one of the few minerals containing the strontium, and along with Celestine are the principal strontium ores. It is named after the element strontium in its chemical formula. Large, individual Strontianite crystals are very rare and sought after by mineral collectors. Strontianite is a fragile mineral and care should be exercised when handling.
Chemical Formula SrCO3
Composition Strontium carbonate, usually containing some calcium
Variable Formula (Sr,Ca)CO3
Color Colorless, white, grayish-white, light yellow, light pink, light orange, and light brown.
Streak White
Hardness 3.5 - 4
Crystal System Orthorhombic
3D Crystal Atlas
(Click for animated model) 
Crystal Forms
and Aggregates
Occurs as dense, fragile, fibrous veins or in massive form, containing microscopic needles or plates. Also forms as globular balls with small visible crystal spikheads. Other forms are in bundles of long, curved crystals, and thin, long, sharply pointed needles. May also form as radiating, fibrous, grainy, and columnar. Rarely occurs in pseudohexagonal trillings and singular prismatic or tabular crystals.
Transparency Transparent to translucent
Specific Gravity 3.7
Luster Vitreous. Greasy on cleaved surfaces.
Cleavage 1,1 - prismatic ; 3,1 - basal
Fracture Uneven
Tenacity Brittle
Other ID Marks Often fluoresces blue or bluish-white in shortwave ultraviolet light.
May also thermoluminesce.
Complex Tests Weakly effervescence in hydrochloric acid
In Group Carbonates; Aragonite group
Striking Features Interesting crystal habits, weight, and hardness
Environment In low temperature sedimentary limestone deposits, sometimes also in weathered basalt and Serpentine.
Rock Type Igneous, Sedimentary, Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 3
Demand (1-3) 2

Strontianite ON EBAY

Strontianite is an ore of the element strontium, used in the refining of sugar and the production of fireworks.

Ecxellent specimens come from Germany in Westphalia at the Dreislar Mine, Winterberg; and the Phoenix quarry, Beckum, where large veins of Strontianite contain pockets of fine crystals. Small, prismatic trillings come from Oberdorf an der Laming, Styria, Austria. A famous locality, from which the name Strontianite is derived, is Strontian, Argyll, Scotland. Other European localities are the Ratum quarry, Vosseveld, Netherlands; the Cavradi gorge, Grischun, Switzerland; and Piagnolo, Campegli, and Casazzascany, Italy.

In the U.S., the best locality is the Minerva No. 1 Mine, Cave-in-Rock, Hardin Co., Illinois. Another excellent occurrence is Lime City Quarry, Lime City, Wood Co., Ohio. Pennsylvania contains several important limestone quarries where this mineral is found, specifically at the Meckley Quarry, Mandata, Union Co.; Winfield,  Union Co., Pennsylvania; and Lime Ridge, Mt. Pleasant Mills, Snyder Co.. Other localities include Schoharie, Schoharie Co., New York; the Holston River Quarry, Dublin, Pulaski Co., Virginia; the Strontium hills near Barstow, San Bernardino Co., California; and the Alverson Mine, Lake Conner, Skagit Co., Washington.

In Canada, Strontianite comes from Mont Saint-Hilaire, Quebec; and the Lafarge Quarry, Dundas, Ontario.

Calcite, Celestine, Barite, Fluorite

Calcite - Lighter in weight, usually forms in different crystal aggregates.
Aragonite - Lighter in weight.
Cerussite and Witherite - Heavier.

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