Baryte and Calcite

ID	430
Mineral	Baryte Calcite
Location	Warden Point - Warden - Isle of Sheppy - United Kingdom
Fluorescence	LW-UV: close SW-UV: close
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Mindat data

ID	549
Long ID	1:1:549:0
Formula	`Ba(SO₄)`
IMA Status	0 1
Other Occurrences	Commonly found as a gangue mineral in metallic ore deposits of epithermal or mesothermal origin; but it may also be found as lenses or replacement deposits in sedimentary rocks, both of hypogene and supergene origin.
Industrial	Used as an additive in drilling fluids, as a white pigment, e. g. in cosmetic products and in paints, and as a filling material for polymers and papers, high contrast medium for medical X-rays. Also the main source of barium.
Diapheny	Transparent,Translucent,Opaque
Cleavage	Perfect on {001}; less so on {210}; Imperfect on {010}.
Tenacity	brittle
Colour	Colourless, white, yellow, brown, grey, blue, etc.; colourless in transmitted light (also tinted yellow, brown, green, blue, etc.)
Hardness (min)	3.0
Hardness (max)	3.0
Luminescence	Fluoresces yellows, orange, or pink in LW; phophsphoresces strongly greenish-white.
Lustre	Vitreous to Resinous, Pearly on cleavage surfaces.
About the name	Named in 1800 by Dietrich Ludwig Gustav Karsten from the Greek βαρύς, heavy, due to its unusual heaviness for a non-metallic mineral.
Streak	white
Crystal System	Orthorhombic
Cleavage Type	Perfect
Fracture type	Irregular/Uneven
Morphology	Usually thin to thick tabular {001}, bounded by {210} alone or in combination with {101}, {011} or other forms. Also flattened {001}, and elongated to prismatic [010] or [100]. More rarely prismatic [001], or equant. Often as aggregates or clusters of tabular crystals with edges projecting into crest-like forms, or as rosettes. Also found as massive material, compact, laminated or concretionary; and in fibrous, stalactic, and earthy masses.
UV	Shades of yellow, occasionally orange or pink (LW UV). Shades of yellow, white (Franklin & Sterling Hill, NJ). May phosphoresce strongly greenish-white.
Thermal Behaviour	Inverts to another (monoclinic?) polymorph when heated to 1149°C. Above 1400°C decomposition to barium oxide, sulphur dioxide and oxygen. Thermoluminescent at times.
Comment Luster	Vitreous to Resinous, Pearly on cleavage surfaces.
key_elements	0
shortcode_ima	Brt
Group	Baryte Group

ID	859
Long ID	1:1:859:4
Formula	`Ca(CO₃)`
IMA Status	0 1
Other Occurrences	Found in most geologic settings and as a later forming replacement mineral in most other environments in one form or another, it is most common as massive material in limestones and marbles. It forms as chemical sedimentary deposits as limestone, can be regionally or contact metamorphosed into marbles and rarely forms igneous rocks (carbonatites). Also is a common gangue mineral in hydrothermal deposits.
Industrial	Mined extensively for a wide variety of uses ranging from lime (cement) to limestone and marble building stones and aggregates, agricultural supplements and optical calcite.
Diapheny	Transparent,Translucent
Cleavage	Perfect on {10_11}.
Tenacity	brittle
Colour	White, Yellow, Red, Orange, Blue, Green, Brown, Gray etc.
Hardness (min)	3.0
Hardness (max)	3.0
Luminescence	Fluorescent
Lustre	Vitreous
About the name	Ancient name. Named as a mineral by Gaius Plinius Secundus (Pliny the elder) in 79 from Calx, Latin for Lime.
Streak	White
Crystal System	Trigonal
Cleavage Type	Perfect
Fracture type	Conchoidal
Morphology	Over 800 different forms have been described. Most commonly as acute rhombohedrons or prismatic with scalenohedral terminations, or combinations of the two.
Twinning	At least four twin laws have been described, the most common being when the twin plane and the composition plane are {01_12}. Also common with twinning on {0001} with {0001} as the compositional surface, producing re-entrant angles. Uncommon with {10_11} or {02_21} as twin planes, producing somewhat heart-shaped crystals ("butterfly" twins).
UV	May be fluorescent under LW UV, mid-range UV or SW UV as well as under X-rays, cathode rays and even sunlight, in a number of colors and shades, commonly an intense red under SW with Mn as an activator (such as at Franklin, New Jersey, USA, and Långban in Sweden.
Comment Luster	Pearly on cleavage and {0001}. Can be dull or earthy in chalk variety.
shortcode_ima	Cal
Group	Calcite Group

Price: € 25

Dimensions: Not registered

Weight: 723 g

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Notes:

Septaria

Symbol	Element
Ba	Barium
C	Carbon
Ca	Calcium
O	Oxygen
S	Sulfur

Baryte and Calcite

Mindat data

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