Juan de Laureano's Photo Gallery

Q2D-0VVQuartz (Var: Chalcedony) SiO₂

San José Mine, Bayarque, Almería, Andalusia, Spain

Field of View: 20 mm



nitana2000 Collection

Q9M-607Sanidine K(AlSi₃O₈)

Los Lobos, Cuevas del Almanzora, Almería, Andalusia, Spain

Sanidine Crystal in Macle of Carlsbald. Crystal 45 mm.

9JJ-CXAKaňkite FeAsO₄·3.5H₂O

Santa Comba Mine, Santa Comba, A Coruña, Galicia, Spain

Field of view about 4 mm. Collected by Carlos J. Rodríguez


Kankita y Kaatialaita de las Minas de Varilongo (Santa Comba, La Coruña, España)
DOI: 10.7597/acopios2171-7788.2012.7

Abstract
C.J. RODRÍGUEZ VÁZQUEZ y C. MENOR-SALVÁN (2012) Kankite and kaatialaite occurrence from the Varilongo Mines (Santa Comba, La Coruña, España). Acopios, 3: 7-19.
The weathering of arsenopyrite, a common accessory mineral in the W-Sn veins at the old Varilongo mines (La Coruña, Spain) produces a series of arsenates usually denominated scorodite without mineral characterization. The detailed study of the oxidized arsenic minerals shows, apart from scorodite, the occurrence of kankite and kaatialaite.

40R-6WYMuscovite KAl₂(AlSi₃O₁₀)(OH)₂

Cillarga Quarry, Ponteareas, Pontevedra, Galicia, Spain

Field of view about 4 mm. Collected by Carlos J. Rodríguez

TEA-AHNEnstatite Mg₂Si₂O₆

La Aljorra Quarries, La Aljorra, Cartagena, Murcia, Spain

Field of view about 2 mm. Ex Carlos J. Rodríguez collection.

94K-XKPAndradite (Var: Demantoid) Ca₃Fe³⁺₂(SiO₄)₃

Herbeira ultramafic massif, A Coruña, Galicia, Spain

A green variety of Andradite.
Field of view about 3 mm. Collected by Carlos J. Rodríguez

References:

Madon, M., Gil, J.I., Via, J. and Girardeau, J. (1991). Characterization and thermodynamic properties of andradite, Ca3Fe2Si3O12. American Mineralogist, 76:1249-1260.

In this publication (Madon et al., 1991), the specimens were found at the cliff base as effect of a detachment; the specimens found by C.J. Rodriguez was located on the top of Herbeira complex, in the rock, and is found in narrow veins (C.J. Rodriguez, pers. com.) with diopside, serpentine and calcite, which cross pyroxenites. These rocks are heterogeneously distributed together with peridotites, dunites, lherzolites, along the top of the mountain and in the slope of the cliff (see also http://www.xente.mundo-r.com/k59/ortegal.htm).

KPA-U9VAndradite Ca₃Fe³⁺₂(SiO₄)₃

Kayes Region, Mali

Dimensions: 4 cm x 4 cm x 3 cm

Single crystal of Andradite Garnet without matrix. Size of crystal 4 x 4 x 3 cm.

ML7-CCMApjohnite Mn²⁺Al₂(SO₄)₄·22H₂O

As Covas, Quiroga, Quiroga, Lugo, Galicia, Spain

This mineral is from As Covas, Quiroga (Lugo).
Analyzed by XRD. Field of view about 3 mm. Collected by Carlos J. Rodríguez

3DY-K9WAragonite CaCO₃

Pantoja, Toledo, Castile-La Mancha, Spain

UV Fluorescence photo (Long Wave). The mineral size is about 15 mm.

HRR-QA1Aragonite CaCO₃

Pantoja, Toledo, Castile-La Mancha, Spain

UV Fluorescence photo (Long Wave). The mineral size is about 18 mm.