Hydroxyapophyllite
SKU: 34071904575

Hydroxyapophyllite

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Description

HydroxyapophylliteLocale: N'Chwaning II Mine, South Africa Approx dimensions: 2. 25 x 1 x 1" Approx weight: 52g This specimen features hydroxyapophyllite crystals with lizardite and calcite on matrix. Properly called "hydroxyapophyllite (K)," hydroxyapophyllite is a variety of apophyllite that is typically colorless. It more frequently grows cubic crystals, but these specimens from the renowned N'Chwaning Mines region form tabular square crystals similar to wulfenite,

Locale: N'Chwaning II Mine, South Africa

Approx dimensions: 2.25 x 1 x 1"

Approx weight: 52g

 

This specimen features hydroxyapophyllite crystals with lizardite and calcite on matrix. Properly called "hydroxyapophyllite-(K)," hydroxyapophyllite is a variety of apophyllite that is typically colorless. It more frequently grows cubic crystals, but these specimens from the renowned N'Chwaning Mines region form tabular square crystals similar to wulfenite, and can be colorless to semi-translucent white with inclusions.

The matte brown mineral coating the specimen is lizardite, which often grows in small spots along the junctions of the hydroxyapophyllite crystal. Calcite druzy glitters through the lizardite and covers the back of the specimen. The calcite has also formed stacks of small scalenohedral crystals. The dark matrix is likely manganese-based; the N'Chwaning mines were established to extract the rich manganese ore in the area.

UV reactivity Some calcite fluoresces and phosphoresces weak red under 365 nm UV light. It can cause the hydroxyapophyllite crystals growing over it to glow a faint red—try it in a dark room with a strong flashlight.

** Brittle warning! Hydroxyapophyllite specimens are somewhat delicate and may shed pieces; limit handling.

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SKU: 34071904575

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4.3 ★★★★★
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Shad Welby, Mystical Maven
Pawtucket, US
★★★★★ 3
Sun Protection, Clogged Pores Included
Size: 1.7 Fl Oz (Pack of 1), Style: SPF 50 Liquid Drops
While this sunscreen is lightweight, sinks into skin nicely, protects against sun damage very well, is truly affordable, and has a residue-free finish, it is not non-comedogenic as advertised. After using it daily for three weeks on my face, throat, the back of my neck, and ears it caused clogged pores on my nose, chin, and forehead and acne on my cheeks, ears, and hairline on the back of my neck. It also increased the overall oiliness of my skin. I did not change any of my other skincare products, usual daily sun exposure, diet, exercise, have health or medication changes, etc. during use, so this sunscreen is the culprit. For reference, I am in my late 40s and have combination skin on the drier side that can be sensitive. I also have psoriasis but had no active patches while using this product. Before applying the sunscreen, I used an acne cleanser with 2% salicylic acid (currently using Cetaphil's new one), Cosrx 6 Peptide Booster, CeraVe Vitamin C serum, and then Vanicream Facial Moisturizer, letting all products absorb well for at least 10 minutes before applying the sunscreen. (I have used this same routine for over two years with excellent results.) Then, I applied two finger lengths of the sunscreen to my face and neck, another to the back of my neck, and a decent-size dab to my ears. The sunscreen melts in quickly and leaves a slight white cast initially, but it dissipates quickly. I'm very fair, however, so this may just be my coloring. In aminute or two, the sunscreen is dry to the touch and ready for makeup application, for those who wear it. I haven't given the sunscreen a test drive with makeup since I prefer not to wear it. The finish is satin-like on my skin, not matte as advertised or shiny as mentioned by some reviewers. My skin experienced some oil breakthrough after a couple of hours, but that's typical for any sunscreen. It was more than the Korean brands I prefer with chemical UV filters, however, even ones that are more moisturizing. Unfortunately, this is another American sunscreen fail for me. I'll use it up on my arms and legs. Oh, one final note: some folks are whinging about the size of the bottle. It holds 1.7 ounces of product in a very convenient, purse- or pocket-friendly size. 1.7 ounces is a standard volume for many brands of both American and Korean sunscreen, and this is actually a relevant selling point since it's not an unwieldy tube. Go by the weight when buying liquids, folks!
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Reviewed in the United States on October 30, 2025
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B. Mulder
Lowell, US
★★★★★ 5
Worked well near the equator
Style: SPF 50
I bought this product because I was going to be in the field for a month, outside, every day, all day, in Tanzania at high altitude. A severe sunburn would be hard to treat in the remote area we were in, but also I am very careful about protecting my skin from aging. I had to have mineral based sunscreen because as a whitewater kayaker I know it’s the only truly water resistant kind and it was going to be sweaty. And since I knew I was going to be putting it on every day, and we didn’t have running water in the field (bucket showers only) I didn’t want it to feel gross. (I really wanted to try the spray but I didn’t want to put anything pressurized in my luggage.) And I had already discovered the Coola face sunscreen (30spf version) which had impressed me with how silky smooth and not greasy it is. Now this IS greasier because it is a higher SPF. BUT I think this product is as good as you’re going to get with the protection you’re getting. Like I said, I’m a white water tiger, so I have used a LOT of mineral sunscreens. This was hands down the most comfortable one I’ve used. And it was effective. I didn’t burn once—only time I did burn was when I forgot to put it on one day toward the end of the trip, when we were out for just a couple hours—and I got the first 2nd degree burn I’ve ever had in my life. That was what this stuff had protected me from, all day every day, the entire trip. I did tan a little but I think that was mostly from the few times I was not covered during short bouts or it was cloudy. For my face I used the Coola 50spf face product.
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Reviewed in the United States on August 7, 2022
S
Verified Purchase
SavanahClark
Belleville, US
★★★★★ 5
Love this stuff!
Style: SPF 50
I use this every day and I love how it is frangrance free and creamy. I have a very fair complexion and I will say it leaves a slight white cast but it doesn’t bother me because it almost makes my fairness more creamy looking. My skin texture has improved since wearing it daily and no allergies from it. I highly recommend especially if you have fairer skin otherwise it may leave a cast .
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Reviewed in the United States on February 19, 2023
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Verified Purchase
Dawn
Alexandria, US
★★★★★ 5
Excellent mineral sunscreen with minimal white cast.
Style: SPF 50
This is one of the healthier sunscreens I’ve found so far. You’re not likely going to find a mineral sunscreen that doesn’t leave some white cast. However, this one rubs in pretty good with minimal cast. You can dab on and rub in fairly easily… as long as you don’t use too much the white cast should be minimal. I am not sure how well this would work on darker skin tones. My arms are a medium skin tone… my legs are more of a light-medium tone. I prefer mineral sunscreens, and this is the best one I found so far and compatible to Supergoop mineral play. If you liked that one, you would likely enjoy this Coola one too.
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Reviewed in the United States on January 25, 2025
K
Verified Purchase
Kaitlyn Jacobson
Lake Worth, US
★★★★★ 1
Would not recommend
Style: SPF 50
I literally never write reviews but felt compelled to write one for this sunscreen because I was very caught off guard by all the positive reviews. This sunscreen leaves the most insane white sheen that never soaks in and gets on EVERYTHING. I put this on and drove to the beach and had sunscreen on my car seat, the steering wheel, the center console, the door, EVERYWHERE! It took forever to clean up and was such a hassle and that was after having let the sunscreen soak into my skin for an hour. Also the sunscreen is really thick and difficult to spread and makes you look ghostly white. Plus, the sunscreen has a really odd odor that reminded me of play dough? That might not be a negative thing for everyone but I found it unpleasant. There are definitely better mineral sunscreens out there. For the price I expected a much better product.
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Reviewed in the United States on June 11, 2025

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