Agate

Tumbled phosphosiderite tumbled has a color range between pink and deep lilac, with a matte finish and occasional yellow veins. It has a rhomboid appearance and usually a smooth feel, although sometimes tiny holes are found. Mined in Chile, Germany, Argentina, and the USA, phosphosiderite tumbled is frequently made into flat-backed cabochons.

Monzonite is a coarse-grained (phaneritic) igneous rock. Such rocks are classified by their relative percentages of quartz, plagioclase, alkali feldspar, and feldspathoid (the QAPF classification). Monzonite is defined as rock having less than 5% quartz in its QAPF fraction and in which alkali feldspar makes up between 35% and 65% of the total feldspar content. Monzonite may also contain minor amounts of hornblende, biotite and other minerals. If quartz constitutes greater than 5% of the QAPF fraction, the rock is termed a quartz monzonite, while if feldspathoids are present as up to 10% of the QAPF fraction, the rock is termed a feldspathoid-bearing monzonite. Rock richer in alkali feldspar is classified as syenite, while rock richer in plagioclase is termed a monzodiorite. The volcanic equivalent of monzonite is latite. The plagioclase in monzonite is sodium-rich, ranging from oligoclase to andesine, and is moderately well shaped (subhedral to euhedral). The alkali feldspar is typically orthoclase. Monzonite may also contain minor amounts of hornblende, biotite and other minerals.